SCALANCE S and SOFTNET Security Client

SCALANCE S and SOFTNET Security Client
Preface
SIMATIC NET
SCALANCE S and SOFTNET
Security Client
Operating Instructions
02/2011
C79000-G8976-C196-07
Introduction and basics
1
Product properties and
commissioning
2
GETTING STARTED
3
Configuring with the Security
Configuration Tool
4
Firewall, router and other
module properties
5
Secure communication in the
VPN over an IPSec tunnel
(S612/S613)
6
SOFTNET Security Client
(S612/S613)
7
Online functions - test,
diagnostics, and logging
8
Tips and help on problems
A
Notes on the CE Mark
B
References
C
Dimension drawing
D
Document history
E
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the corresponding information is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation for the specific task, in particular its warning notices and
safety instructions. Qualified personnel are those who, based on their training and experience, are capable of
identifying risks and avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be adhered to. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this
publication may be trademarks whose use by third parties for their own purposes could violate the rights of the
owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
order number: C79000-G8976-C196-07
Ⓟ 02/2011
Copyright © Siemens AG 2006,
2007, 2008, 2010, 2011.
Technical data subject to change
Preface
This manual…
...supports you when commissioning the SCALANCE S602 / S612 / S613 security modules
and the SOFTNET Security Client. The variants SCALANCE S602 / S612 / S613 are simply
called SCALANCE S in the rest of the manual.
SCALANCE S and SOFTNET Security Client
Operating Instructions, 02/2011, C79000-G8976-C196-07
3
Preface
New in this issue
This issue includes descriptions of the following new functions:
● Security Configuration Tool V2.3
To improve handling and achieve a better overview of the various module types, the
procedures for module integration and module replacement have been improved.
You can configure a SOFTNET Security Client V3.0 together with an MD741-1 and
create the corresponding configuration files (see GETTING STARTED Example 5:
Remote access - VPN tunnel example with MD741-1 and SOFTNET Security Client
(Page 86)).
For the IKE mode (phase 1), you can set the encryption algorithms AES-128, AES-192
and AES-256.
Apart from the operating systems Windows XP SP2 and Windows XP SP3, the Windows
7 operating system is also supported (not the Home version).
● SOFTNET Security Client V3.0
To improve visualization and diagnostics of the statuses of the connections, new icons
were implemented and an additional diagnostics overview ("Advanced diagnostics") was
added.
For the logging console in the tunnel overview, you can now make settings relating to the
messages to be displayed and the size of the log files.
To save costs on volume-oriented connections, you have the option of deactivating the
reachability test at the cost of the diagnostics capability of the SOFTNET Security Client
V3.0.
During diagnostics of the reachability of tunnel partners, it is possible that the reachability
is shown as being negative although communication does work in principle. This occurs
with tunnels via slower transmission paths (UMTS, GPRS etc.). In this case, the wait time
for the ping reply (reachability test) can be globally increased.
Connection establishment to an MD741-1 is supported. In this context, a DynDNS
address can be configured (see GETTING STARTED Example 5: Remote access - VPN
tunnel example with MD741-1 and SOFTNET Security Client (Page 86)).
Apart from the operating systems Windows XP SP2 and Windows XP SP3, the Windows
7 operating system is also supported (not the Home version).
● Configuration data for module MD 741-1
To configure an external MD741-1 for access with the SOFTNET Security Client V3.0,
you can export the configuration data to a text file with the Security Configuration Tool
V2.3. (GETTING STARTED Example 5: Remote access - VPN tunnel example with
MD741-1 and SOFTNET Security Client (Page 86)).
SCALANCE S and SOFTNET Security Client
4
Operating Instructions, 02/2011, C79000-G8976-C196-07
Preface
Validity of this manual
This manual is valid for the following devices and components:
● SIMATIC NET SCALANCE S602 6GK5 602-0BA00-2AA3 - with firmware version as of
V2.3
● SIMATIC NET SCALANCE S612 V2 6GK5 612-0BA00-2AA3 - with firmware version as
of V2.3
● SIMATIC NET SCALANCE S613 V2 6GK5 613-0BA00-2AA3 - with firmware version as
of V2.3
● SIMATIC NET SOFTNET Security Client 6GK1 704-1VW02-0AA0 - as of version 2008
● Security Configuration Tool - version V2.3
Audience
This manual is intended for personnel involved in the commissioning of SCALANCE S
Security Modules and the SOFTNET Security Client in a network.
Further documentation
The "SIMATIC NET Industrial Ethernet Twisted Pair and Fiber Optic Networks“ manual
contains additional information on other SIMATIC NET products that you can operate along
with the SCALANCE S security module in an Industrial Ethernet network.
You can download this network manual in electronic format from Customer Support at the
following address:
http://support.automation.siemens.com/WW/view/de/1172207
(http://support.automation.siemens.com/WW/view/de/1172207)
Standards and approvals
The SCALANCE S device meets the requirements for the CE mark. For more detailed
information, refer to the appendix of this manual.
Symbols used in this manual
This symbol highlights special tips in the manual.
This symbol indicates specific further reading material.
This symbol indicates that detailed help texts are available in the context help. You can call
this with the F1 key or using the "Help" button in the relevant dialog.
F1
SCALANCE S and SOFTNET Security Client
Operating Instructions, 02/2011, C79000-G8976-C196-07
5
Preface
References /.../
References to other documentation are shown in slashes /.../. Based on these numbers, you
can find the title of the documentation in the references at the end of the manual.
SCALANCE S and SOFTNET Security Client
6
Operating Instructions, 02/2011, C79000-G8976-C196-07
Contents
Preface ...................................................................................................................................................... 3
1
2
3
Introduction and basics............................................................................................................................ 11
1.1
Uses of the SCALANCE S612, S613 and SOFTNET Security Client .........................................11
1.2
Using the SCALANCE S602 ........................................................................................................14
1.3
Configuration and administration .................................................................................................16
Product properties and commissioning .................................................................................................... 17
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.1.9
Product Characteristics................................................................................................................17
Hardware characteristics and overview of the functions .............................................................17
Components of the product..........................................................................................................18
Unpacking and checking..............................................................................................................19
Attachment to Ethernet ................................................................................................................19
Power supply................................................................................................................................20
Signaling contact..........................................................................................................................21
Reset button - resetting the configuration to factory defaults ......................................................22
Displays........................................................................................................................................23
Technical specifications ...............................................................................................................24
2.2
2.2.1
2.2.2
2.2.3
2.2.4
Installation ....................................................................................................................................26
Installation on a DIN rail...............................................................................................................28
Installation on a standard rail .......................................................................................................30
Wall mounting ..............................................................................................................................30
Grounding ....................................................................................................................................31
2.3
2.3.1
2.3.2
Commissioning.............................................................................................................................31
Step 1: Connecting the SCALANCE S module............................................................................33
Step 2: Configuring and downloading..........................................................................................33
2.4
C-PLUG (configuration plug)........................................................................................................35
2.5
Transferring firmware...................................................................................................................38
GETTING STARTED ............................................................................................................................... 39
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613 .........................40
Overview ......................................................................................................................................40
Set up SCALANCE S and the network ........................................................................................41
Make the IP settings for the PCs .................................................................................................42
Create the project and modules...................................................................................................44
Configuring a tunnel connection ..................................................................................................45
Download the configuration to the SCALANCE S module ..........................................................46
Test the tunnel function (ping test) ..............................................................................................47
3.2
3.2.1
3.2.2
3.2.3
3.2.4
Example 2: Firewall - Operating a SCALANCE S as a firewall ...................................................48
Overview ......................................................................................................................................48
Set up SCALANCE S and the network ........................................................................................50
Make the IP settings for the PCs .................................................................................................51
Create the project and module.....................................................................................................52
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Contents
3.2.5
3.2.6
3.2.7
3.2.8
Configure the firewall .................................................................................................................. 54
Download the configuration to the SCALANCE S module.......................................................... 56
Test the firewall function (ping test) ............................................................................................ 56
Log firewall data traffic ................................................................................................................ 58
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router................ 59
Overview ..................................................................................................................................... 59
Set up SCALANCE S and the network ....................................................................................... 61
Make the IP settings for the PCs ................................................................................................ 62
Create the project and module.................................................................................................... 63
Configuring the NAT router mode ............................................................................................... 65
Configure the firewall .................................................................................................................. 67
Download the configuration to the SCALANCE S module.......................................................... 70
Test the NAT router function (ping test)...................................................................................... 70
3.4
Example 4: Remote access - VPN tunnel example with SCALANCE S612 / S613 and
SOFTNET Security Client ........................................................................................................... 73
Overview ..................................................................................................................................... 73
Set up SCALANCE S and the network ....................................................................................... 75
Make the IP settings for the PCs ................................................................................................ 76
Create the project and modules.................................................................................................. 78
Configuring a tunnel connection ................................................................................................. 81
Loading the configuration on the SCALANCE S and saving the SOFTNET Security Client
configuration................................................................................................................................ 82
Set up a tunnel with the SOFTNET Security Client .................................................................... 83
Test the tunnel function (ping test).............................................................................................. 84
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.4.8
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.5.8
3.5.9
4
Example 5: Remote access - VPN tunnel example with MD741-1 and SOFTNET Security
Client ........................................................................................................................................... 86
Overview ..................................................................................................................................... 86
Setting up the MD741-1 and the network ................................................................................... 88
Make the IP settings for the PCs ................................................................................................ 89
Create the project and modules.................................................................................................. 90
Configuring a tunnel connection ................................................................................................. 91
Saving the configuration of the MD741-1 and the SOFTNET Security Client ............................ 94
Configuring the MD741-1 ............................................................................................................ 94
Setting up a tunnel with the SOFTNET Security Client ............................................................ 101
Test the tunnel function (ping test)............................................................................................ 103
Configuring with the Security Configuration Tool ................................................................................... 107
4.1
Range functions and how they work ......................................................................................... 107
4.2
Installation ................................................................................................................................. 109
4.3
User interface and menu commands ........................................................................................ 110
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
Managing projects..................................................................................................................... 113
Overview ................................................................................................................................... 113
Creating and editing projects .................................................................................................... 115
Setting up users ........................................................................................................................ 118
Consistency checks .................................................................................................................. 120
You can assign symbolic names for IP / MAC addresses. ....................................................... 121
4.5
Download the configuration to the SCALANCE S module........................................................ 124
4.6
Configuration data for MD 740 / MD 741 .................................................................................. 126
SCALANCE S and SOFTNET Security Client
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Contents
5
6
Firewall, router and other module properties ......................................................................................... 129
5.1
5.1.1
5.1.2
5.1.3
Overview / basics.......................................................................................................................129
SCALANCE S as firewall ...........................................................................................................129
SCALANCE S as router .............................................................................................................130
SCALANCE S as DHCP server .................................................................................................131
5.2
Creating modules and setting network parameters ...................................................................131
5.3
5.3.1
5.3.2
Firewall - module properties in standard mode..........................................................................135
Configure the firewall .................................................................................................................135
Firewall defaults .........................................................................................................................138
5.4
5.4.1
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
5.4.8
5.4.9
5.4.10
Firewall - module properties in advanced mode ........................................................................140
Configure the firewall .................................................................................................................141
Global firewall rules....................................................................................................................142
Setting local IP packet filter rules...............................................................................................144
IP packet filter rules ...................................................................................................................146
Defining IP services ...................................................................................................................149
defining ICMP services ..............................................................................................................151
Setting MAC packet filter rules...................................................................................................153
MAC packet filter rules...............................................................................................................154
defining MAC services ...............................................................................................................156
Setting up service groups ..........................................................................................................158
5.5
Time synchronization .................................................................................................................159
5.6
Creating SSL certificates ...........................................................................................................161
5.7
5.7.1
5.7.2
5.7.3
5.7.4
Routing mode.............................................................................................................................162
Routing.......................................................................................................................................162
NAT/NAPT routing .....................................................................................................................164
NAT/NAPT routing - Examples of configuration part 1 ..............................................................168
NAT/NAPT routing - Examples of configuration part 2 ..............................................................170
5.8
DHCP server ..............................................................................................................................172
Secure communication in the VPN over an IPSec tunnel (S612/S613) ................................................. 177
6.1
VPN with SCALANCE S ............................................................................................................177
6.2
6.2.1
6.2.2
Groups .......................................................................................................................................180
Creating groups and assigning modules ...................................................................................180
Module types within a group ......................................................................................................182
6.3
Tunnel configuration in standard mode .....................................................................................183
6.4
6.4.1
6.4.2
6.4.3
6.4.4
Tunnel configuration in advanced mode....................................................................................183
Configuring group properties .....................................................................................................184
Including a SCALANCE S in a configured group.......................................................................187
SOFTNET Security Client ..........................................................................................................188
Configuring module-specific VPN properties .............................................................................189
6.5
6.5.1
6.5.2
6.5.3
Configuring internal network nodes ...........................................................................................192
How the learning mode works....................................................................................................192
Displaying the detected internal nodes......................................................................................194
Configuring nodes manually ......................................................................................................195
SCALANCE S and SOFTNET Security Client
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9
Contents
7
8
A
SOFTNET Security Client (S612/S613) ................................................................................................. 199
7.1
Using the SOFTNET Security Client......................................................................................... 199
7.2
7.2.1
7.2.2
Installation and commissioning of the SOFTNET Security Client............................................. 202
Installing and starting SOFTNET Security Client ...................................................................... 202
Uninstalling SOFTNET Security Client ..................................................................................... 203
7.3
Creating a configuration file with the Security Configuration Tool ............................................ 203
7.4
Working with SOFTNET Security Client ................................................................................... 206
7.5
Setting up and editing tunnels................................................................................................... 209
Online functions - test, diagnostics, and logging .................................................................................... 219
8.1
Overview of the functions in the online dialog........................................................................... 220
8.2
8.2.1
8.2.2
8.2.3
Logging events.......................................................................................................................... 222
Local log - settings in the configuration..................................................................................... 223
Network Syslog - settings in the configuration .......................................................................... 225
Configuring packet logging........................................................................................................ 228
Tips and help on problems..................................................................................................................... 231
A.1
SCALANCE S module does not boot correctly ......................................................................... 231
A.2
SCALANCE S module cannot be reached................................................................................ 231
A.3
Replacing a SCALANCE S module .......................................................................................... 231
A.4
SCALANCE S module is compromised .................................................................................... 231
A.5
Key from the configuration data compromised or lost .............................................................. 232
A.6
General operational response................................................................................................... 233
B
Notes on the CE Mark ........................................................................................................................... 235
C
References ............................................................................................................................................ 237
D
Dimension drawing ................................................................................................................................ 239
E
Document history................................................................................................................................... 241
E.1
Document history ...................................................................................................................... 241
Glossary / abbreviations and acronyms ................................................................................................. 243
Index...................................................................................................................................................... 255
SCALANCE S and SOFTNET Security Client
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Introduction and basics
1
With SIMATIC NET SCALANCE S and SIMATIC NET SOFTNET Security Client, you have
chosen the SIEMENS security concept that meets the exacting requirements of secure
communication in industrial automation engineering.
This chapter provides you with an overview of the security functions of the devices and
components.
● SCALANCE S Security Module
● SOFTNET Security Client
Tip:
To get started quickly with the SCALANCE S, work through Chapter 3 "GETTING
STARTED".
1.1
Uses of the SCALANCE S612, S613 and SOFTNET Security Client
All-round protection - the job of SCALANCE S612 / S613
With a combination of different security measures such as firewall, NAT/NAPT routers and
VPN (Virtual Private Network) over IPsec tunnels, the SCALANCE S612 / S613 devices
protect individual devices or even entire automation cells from:
● Data espionage
● Data manipulation
● Unauthorized access
SCALANCE S612 / S613 allows this protection flexibly, without repercussions, protocolindependent (as of Layer 2 according to IEEE 802.3) and without complicated handling.
SCALANCE S612 / S613 and SOFTNET Security Client are configured with the Security
Configuration Tool.
SCALANCE S and SOFTNET Security Client
Operating Instructions, 02/2011, C79000-G8976-C196-07
11
Introduction and basics
1.1 Uses of the SCALANCE S612, S613 and SOFTNET Security Client
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Security functions
● Firewall
– IP firewall with stateful packet inspection;
– Firewall also for Ethernet "non-IP" frames according to IEEE 802.3
(layer 2 frames; does not apply if router mode is used)
– Bandwidth limitation
All network nodes located in the internal network segment of a SCALANCE S are
protected by its firewall.
● Communication made secure by IPsec tunnels
SCALANCE S612 / S613 devices and SOFTNET Security Clients can be configured to
form groups. IPsec tunnels are created between all SCALANCE S612 / S613 devices and
a SOFTNET Security Client of a group (VPN, Virtual Private Network). All internal nodes
of this SCALANCE S can communicate securely with each other through these tunnels.
SCALANCE S and SOFTNET Security Client
12
Operating Instructions, 02/2011, C79000-G8976-C196-07
Introduction and basics
1.1 Uses of the SCALANCE S612, S613 and SOFTNET Security Client
● Protocol-independent
Tunneling also includes Ethernet frames according to IEEE 802.3 (layer 2 frames; does
not apply if router mode is used).
Both IP and non-IP frames are transmitted through the IPsec tunnel.
● Router mode
By operating the SCALANCE S as a router, you connect the internal network with the
external network. The internal network connected by SCALANCE S therefore becomes a
separate subnet.
● Protection for devices and network segments
The firewall and VPN protective function can be applied to the operation of single
devices, several devices, or entire network segments.
● No repercussions when included in flat networks (bridge mode)
Internal network nodes can be found without configuration. This means that when a
SCALANCE S612 / S613 is installed in an existing network infrastructure, the end
devices do not need to be reconfigured.
The module attempts to find internal nodes; internal nodes that cannot be found in this
way must nevertheless be configured.
PC/PG communication in the VPN - job of the SOFTNET Security Client
With the SOFTNET Security Client PC software, secure remote access is possible from
PCs/PGs to automation systems protected by SCALANCE S via public networks.
With the SOFTNET Security Client, a PC/PG is configured automatically so that it can
establish secure IPsec tunnel communication in the VPN (Virtual Private Network) with one
or more SCALANCE S devices.
PG/PC applications such as NCM Diagnostics or STEP 7 can then access devices or
networks in an internal network protected by SCALANCE S over a secure tunnel connection.
The SOFTNET Security Client PC software is also configured with the Security Configuration
Tool ensuring fully integrated configuration without any special security know-how.
SCALANCE S and SOFTNET Security Client
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13
Introduction and basics
1.2 Using the SCALANCE S602
Internal and external network nodes
SCALANCE S612 / S613 divides networks into two areas:
● Internal network: Protected areas with the "internal nodes"
Internal nodes are all the nodes secured by a SCALANCE S.
● External network: Unprotected areas with the "external nodes"
External nodes are all the nodes located outside the protected areas.
NOTICE
The internal network is considered to be secure (trustworthy).
Connect an internal network segment to the external network segments only over
SCALANCE S.
There must be no other paths connecting the internal and external network!
1.2
Using the SCALANCE S602
Firewall and router - the job of the SCALANCE S602
With a combination of different security measures such as firewall and NAT/NAPT routers,
the SCALANCE S602 protects individual devices or even entire automation cells from:
● Data espionage
● Unauthorized access
SCALANCE S602 allows this protection flexibly and without complicated handling.
SCALANCE S602 is configured with the Security Configuration Tool.
SCALANCE S and SOFTNET Security Client
14
Operating Instructions, 02/2011, C79000-G8976-C196-07
Introduction and basics
1.2 Using the SCALANCE S602
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Security functions
● Firewall
– IP firewall with stateful packet inspection;
– Firewall also for Ethernet "non-IP" frames according to IEEE 802.3
(layer 2 frames; does not apply to S602 if router mode is used);
– Bandwidth limitation
All network nodes located in the internal network segment of a SCALANCE S are
protected by its firewall.
● Router mode
By operating the SCALANCE S as a router, you separate the internal network from the
external network. The internal network connected over SCALANCE S therefore becomes
a separate subnet; SCALANCE S must be addressed explicitly as a router using its IP
address.
● Protection for devices and network segments
The firewall protective function can be applied to the operation of single devices, several
devices, or entire network segments.
● No repercussions when included in flat networks (bridge mode)
This means that when a SCALANCE S602 is installed in an existing network
infrastructure, the settings of end devices do not need to be made again.
SCALANCE S and SOFTNET Security Client
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Introduction and basics
1.3 Configuration and administration
Internal and external network nodes
SCALANCE S602 divides networks into two areas:
● Internal network: Protected areas with the "internal nodes"
Internal nodes are all the nodes secured by a SCALANCE S.
● External network: Unprotected areas with the "external nodes"
External nodes are all the nodes located outside the protected areas.
NOTICE
The internal network is considered to be secure (trustworthy).
Connect an internal network segment to the external network segments only over
SCALANCE S.
There must be no other paths connecting the internal and external network!
1.3
Configuration and administration
The most important features at a glance
In conjunction with the Security Configuration Tool, you are guided to a simple and secure
application of the SCALANCE S modules:
● Configuration without expert IT knowledge with the Security Configuration Tool
With the Security Configuration Tool, a SCALANCE S module can be set by non IT
experts. When necessary, more complex settings can be made in an extended mode.
● Secure administrative communication
The settings are transferred to SCALANCE S over an SSL-encrypted connection.
● Access protection in the Security Configuration Tool
The user administration of the Security Configuration Tool ensures access protection for
the SCALANCE S devices and the configuration data.
● C-PLUG exchangeable memory medium can be used
The C-PLUG is a plug-in memory medium on which the encrypted configuration data can
be stored. It allows configuration without a PC/PG when replacing a SCALANCE S.
SCALANCE S and SOFTNET Security Client
16
Operating Instructions, 02/2011, C79000-G8976-C196-07
Product properties and commissioning
2
This chapter will familiarize you with the handling and all important properties of the
SCALANCE S device.
You will learn how the device can be installed and commissioned in a few simple steps.
Further information
How to configure the device for standard applications is shown in a condensed form in the
Chapter "GETTING STARTED".
For details on configuration and the online functions, refer to the reference section of the
manual.
2.1
Product Characteristics
Note
The specified approvals apply only when the corresponding mark is printed on the product.
2.1.1
Hardware characteristics and overview of the functions
All SCALANCE S modules have the following essential characteristics:
Hardware
● Robust housing with degree of protection IP30
● Optional mounting on an S7-300 or DIN 35 mm rail
● Redundant power supply
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Product properties and commissioning
2.1 Product Characteristics
● Signaling contact
● Extended temperature range (-20 °C to +70 °C SCALANCE S613)
Overview of the functions of the device types
The following table shows you the functions supported by your device.
Note
This manual describes all functions. Based on the following table, you can recognize which
descriptions apply to the device you are using.
You should also note the additional information in the titles of the sections.
Table 2- 1
Overview of the functions
Function
S602
S612 V1
S612 V2
S613 V1
S613 V2
Firewall
x
x
x
x
x
NAT/NAPT router
x
-
x
-
x
DHCP server
x
-
x
-
x
Network Syslog
x
-
x
-
x
IPsec tunnel (VPN, Virtual Private Network)
-
x
x
x
x
SOFTNET Security Client
-
x
x
x
x
x Function supported
- Function not supported
2.1.2
Components of the product
What ships with the SCALANCE S?
● SCALANCE S device
● 2-pin plug-in terminal block
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Product properties and commissioning
2.1 Product Characteristics
● 4-pin plug-in terminal block
● Information on the product
● CD with the following content:
– Manual
– Security Configuration Tool
2.1.3
Unpacking and checking
Unpacking, checking
1. Make sure that the package is complete.
2. Check all the parts for transport damage.
WARNING
Do not use any parts that show evidence of damage!
2.1.4
Attachment to Ethernet
Possible attachments
SCALANCE S has 2 RJ-45 jacks for attachment to Ethernet.
Note
TP cords or TP-XP cords with a maximum length of 10 m can be connected at the RJ-45 TP
port.
In conjunction with the Industrial Ethernet FastConnect IE FC Standard Cable and IE FC RJ45 Plug 180, a total cable length of maximum 100 m is possible between two devices.
NOTICE
The Ethernet attachments at port 1 and port 2 are handled differently by the SCALANCE S
and must not be swapped over when connecting to the communication network:
 Port 1 - external network
upper RJ-45 jack, marked red = unprotected network area;
 Port 2 - Internal Network
Lower RJ-45 jack, marked green = network protected by SCALANCE S;
If the ports are swapped over, the device loses its protective function.
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Product properties and commissioning
2.1 Product Characteristics
Autonegotiation
SCALANCE S supports autonegotiation.
Autonegotiation means that the connection and transmission parameters are negotiated
automatically with the addressed network node.
MDI /MDIX autocrossover function
SCALANCE S supports the MDI / MDIX autocrossover function.
The advantage of the MDI /MDIX autocrossover function is that straight-through cables can
be used throughout and crossover Ethernet cables are unnecessary. This prevents
malfunctions resulting from mismatching send and receive wires. This greatly simplifies
installation.
2.1.5
Power supply
WARNING
The SCALANCE S is designed for operation with safety extra-low voltage. This means that
only safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit to supply the SCALANCE S must comply with NEC Class 2 (voltage
range 18 - 32 V, current requirement 250 mA).
The device may only be supplied by a power unit that meets the requirements of class 2 for
power supply units of the "National Electrical Code, Table 11 (b)". If the device is connected
to a redundant power supply (two separate power supplies), both must meet these
requirements.
NOTICE
Never connect the SCALANCE S to AC voltage or to DC voltage higher than 32 VDC.
The power supply is connected using a 4-pin plug-in terminal block. The power supply can
be connected redundantly. Both inputs are isolated. There is no distribution of load. When a
redundant power supply is used, the power supply unit with the higher output voltage
supplies the SCALANCE S alone. The power supply is connected over a high resistance
with the enclosure to allow an ungrounded set up.
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Product properties and commissioning
2.1 Product Characteristics
Figure 2-1
2.1.6
Power supply
Signaling contact
NOTICE
The signaling contact can be subjected to a maximum load of 100 mA (safety extra-low
voltage (SELV), DC 24 V).
Never connect the SCALANCE S to AC voltage or to DC voltage higher than 32 V DC.
The signaling contact is connected to a 2-pin plug-in terminal block. The signaling contact is
a floating switch with which error/fault states can be signaled by breaking the contact.
The following errors/faults can be signaled by the signaling contact:
● Fault in the power supply
● Internal fault
If a fault occurs or if no power is applied to the SCALANCE S, the signaling contact is
opened. In normal operation, it is closed.
Figure 2-2
Signaling contact
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Product properties and commissioning
2.1 Product Characteristics
2.1.7
Reset button - resetting the configuration to factory defaults
SCALANCE S has a reset button. The reset button is located on the rear of the housing
below a cover secured with screws immediately beside the C-PLUG.
The reset button is mechanically protected against being activated accidentally.
NOTICE
Make sure that only authorized personnel has access to the SCALANCE S.
What does the button do?
Two functions can be triggered with the reset button:
● Restart
The module is restarted. The loaded configuration is retained.
● Reset to factory settings
The module is restarted and reset to the status set in the factory. A loaded configuration
is deleted.
Restart - follow the steps below
1. If necessary, remove the SCALANCE S module from its mounting to allow access to the
recess.
2. Remove the M32 plug on the rear of the device.
The reset button is in a recess on the rear of the SCALANCE S directory beside the slot
for the C-PLUG. This recess is protected by a screw plug. The button is located in a
narrow hole and is therefore protected from being activated accidentally.
3. Press the reset button for less than five seconds.
The restart takes up to 2 minutes. During the restart, the fault LED is lit yellow. Make sure
that the power supply is not interrupted during the reset.
On completion of the restart, the device automatically changes to productive mode. The
fault LED is then lit permanently green.
4. Close the recess with the M32 plug and mount the device again.
Reset to factory settings - follow the steps below
NOTICE
If a C-PLUG is plugged in when you reset to factory settings, the C-PLUG is erased!
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Product properties and commissioning
2.1 Product Characteristics
1. If necessary, remove the SCALANCE S module from its mounting to allow access to the
recess.
2. Remove the M32 plug on the rear of the device.
The reset button is in a recess on the rear of the SCALANCE S directory beside the slot
for the C-PLUG. This recess is protected by a screw plug. The button is located in a
narrow hole and is therefore protected from being activated accidentally.
3. Press the reset button and keep it pressed for longer than 5 seconds until the fault LED
flashes yellow-red.
Resetting takes up to 2 minutes. During the reset, the fault LED flashes yellow-red. Make
sure that the power supply is not interrupted during the reset.
On completion of the reset, the device starts up again automatically. The fault LED is
then lit yellow.
4. Close the recess with the M32 plug and mount the device again.
2.1.8
Displays
3RUWVWDWXV/('V3DQG7;
3RUWVWDWXV/('V3DQG7;
)DXOWDQGSRZHU/('V
Fault LED
Display of the operating state:
Status
Meaning
Lit red
Module detects an error.
(Signaling contact is open).
The following faults are detected:

Internal error/fault (for example: startup failed)

Invalid C-PLUG (invalid formatting)
Lit green
Module in productive operation
NOT lit
Module failure; no power supply
(Signaling contact closed).
(Signaling contact open).
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Product properties and commissioning
2.1 Product Characteristics
Status
Meaning
Lit yellow (constant)
Module in startup.
(Signaling contact open).
If no IP address exists, the module remains in this status.
Flashes yellow and red
alternately
Module resets itself to factory settings.
(Signaling contact open).
Power LEDs (L1, L2)
The status of the power supply is indicated by two LEDs:
Status
Meaning
Lit green
Power supply L1 or L2 is connected.
Not lit
Power supply L1 or L2 not connected or < 14 V (L+)
Lit red
Power supply L1 or L2 failed during operation or < 14 V (L+)
Port status LEDs (P1 and TX, P2 and TX)
The status of the interfaces is indicated by 2 LEDs for each of the two ports:
Status
Meaning
LED P1 / P2
Lit green
TP link exists
Flashes / lit yellow
Receiving data at RX
off
No TP link or no data being received
LED TX
2.1.9
Flashes / lit yellow
Data being sent
off
No data being sent
Technical specifications
Connectors
Attachment of end devices or network
components over twisted pair
2xRJ–45 jacks with MDI-X pinning 10/100 Mbps
(half/full duplex)
Connector for power supply
1x4-pin plug-in terminal block
Connector for signaling contact
1x2-pin plug-in terminal block
Electrical data
Power supply
Power loss at 24 V DC
24 V DC power supply (18 through 32 V DC)

Implemented redundantly

Safety extra-low voltage (SELV)
3.84 W
SCALANCE S and SOFTNET Security Client
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Operating Instructions, 02/2011, C79000-G8976-C196-07
Product properties and commissioning
2.1 Product Characteristics
Current consumption at rated voltage
250 mA maximum
Permitted cable lengths
Connection over
Industrial Ethernet FC TP cables:
0 - 100 m
Industrial Ethernet FC TP standard cable with
IE FC RJ-45 plug 180
or
Over Industrial Ethernet FC outlet RJ-45 with 0 90 m Industrial Ethernet FC TP standard cable
+ 10 m TP cord
0 - 85 m
Industrial Ethernet FC TP marine/trailing cable
with IE FC RJ-45 plug 180
or
0 - 75 m
Industrial Ethernet FC TP marine/trailing cable +
10 m TP cord
Software configuration limits for VPN
Number of IPsec tunnels
SCALANCE S612
64 maximum
SCALANCE S613
128 maximum
Software "firewall" configuration limits
Number of firewall rules
SCALANCE S602
256 maximum
SCALANCE S612
256 maximum
SCALANCE S613
256 maximum
Permitted environmental conditions / EMC
Operating temperature SCALANCE S602
0 °C through +60 °C
Operating temperature SCALANCE S612
0 °C through +60 °C
Operating temperature SCALANCE S613
-20 °C through +70 °C
Storage/transport temperature
-40 °C through +80 °C
Relative humidity in operation
95% (no condensation)
Operating altitude
Up to 2000 m above sea level at max. 56 °C
ambient temperature
Up to 3000 m above sea level at max. 50 °C
ambient temperature
RF interference level
EN 50081-2 Class A
Immunity
EN 50082-2
Degree of protection
IP 30
Certification
c-UL-us
UL 60950
CSA C22.2 No. 60950
c-Ul-us for hazardous locations
UL 1604, UL 2279Pt.15
FM
FM 3611
C-TICK
AS/NZS 2064 (Class A).
CE
EN 50081-2, EN 50082-2
ATEX Zone 2
EN50021
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25
Product properties and commissioning
2.2 Installation
MTBF
81.09 years
Construction
Dimensions (W x H x D) in mm
60 x 125 x 124
Weight in g
780
Installation options

DIN rail

S7-300 standard rail

Wall mounting
Order numbers
SCALANCE S602
6GK5602-0BA00-2AA3
SCALANCE S612
6GK5612-0BA00-2AA3
SCALANCE S613
6GK5613-0BA00-2AA3
"Industrial Ethernet TP and Fiber Optic Networks" 6GK1970-1BA10-0AA0
manual
Order numbers for accessories
IE FC Stripping Tool
2.2
6GK1901-1GA00
IE FC blade cassettes
6GK1901-1GB00
IE FC TP standard cable
6XV1840 2AH10
IE FC TP trailing cable
6XV1840-3AH10
IE FC TP marine cable
6XV1840-4AH10
IE FC RJ–45 Plug 180
pack of 1
6GK1 901-1BB10-2AA0
IE FC RJ–45 Plug 180
pack of 10
6GK1 901-1BB10-2AB0
IE FC RJ–45 Plug 180
pack of 50
6GK1 901-1BB10-2AE0
Installation
Note
The requirements of EN61000-4-5, surge test on power supply lines are met only when a
Blitzductor VT AD 24V type no. 918 402 is used.
Manufacturer:
DEHN+SÖHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D-92306 Neumarkt,
Germany
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Product properties and commissioning
2.2 Installation
WARNING
When used under hazardous conditions (zone 2), the SCALANCE S product must be
installed in an enclosure.
To comply with ATEX 95 (EN 50021), this enclosure must meet the requirements of at least
IP54 in compliance with EN 60529.
WARNING
EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
Types of installation
The SCALANCE S can be installed in various ways:
● Installation on a 35 mm DIN rail
● Installation on a SIMATIC S7-300 standard rail
● Wall mounting
Note
When installing and operating the device, keep to the installation instructions and safetyrelated notices as described here and in the manual SIMATIC NET Industrial Ethernet
Twisted Pair and Fiber Optic Networks /1/.
NOTICE
We recommend that you provide suitable shade to protect the device from direct
sunlight.
This avoids unwanted warming of the device and prevents premature aging of the
device and cabling.
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Product properties and commissioning
2.2 Installation
2.2.1
Installation on a DIN rail
Installation
Install the SCALANCE S on a 35 mm DIN rail complying with DIN EN 50022.
1. Place the upper catch of the device over the top of the DIN rail and then push in the lower
part of the device against the rail until it clips into place.
2. Install the electrical connecting cables and the terminal block for the signaling contact.
Figure 2-3
SCALANCE S installation on a DIN rail (35 mm)
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Product properties and commissioning
2.2 Installation
Uninstalling
To remove the SCALANCE S from the DIN rail:
1. First disconnect the TP cables and pull out the terminal blocks for the power supply and
the signaling contact.
2. Use a screwdriver to release the lower rail catch of the device and pull the lower part of
the device away from the rail.
Figure 2-4
SCALANCE S removing from a DIN rail (35 mm)
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Product properties and commissioning
2.2 Installation
2.2.2
Installation on a standard rail
Installation on a SIMATIC S7-300 standard rail
1. Place the upper guide at the top of the SCALANCE S housing in the S7 standard rail.
2. Screw the SCALANCE S device to the lower part of the standard rail.
Figure 2-5
2.2.3
SCALANCE S installation on a SIMATIC S7-300 standard rail
Wall mounting
Installation fittings
Use the following fittings, for example when mounting on a concrete wall:
● 4 wall plugs, 6 mm in diameter and 30 mm long
● Screws 3.5 mm in diameter and 40 mm long
Note
The wall mounting must be capable of supporting at least four times the weight of the
device.
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Product properties and commissioning
2.3 Commissioning
2.2.4
Grounding
Installation on a DIN rail
The device is grounded over the DIN rail.
S7 standard rail
The device is grounded over its rear panel and the neck of the screw.
Wall mounting
The device is grounded by the securing screw in the unpainted hole.
NOTICE
Please note that the SCALANCE S must be grounded over one securing screw with
minimum resistance.
2.3
Commissioning
NOTICE
Before putting the device into operation, make sure that you read the information in the
sections "Product properties" and "Installation" carefully and follow the instructions there,
particularly those in the safety notices.
Principle
To operate the SCALANCE S, you need to download a configuration created with the
Security Configuration Tool. This procedure is described below.
A SCALANCE S configuration includes the IP parameters and the setting for firewall rules
and, if applicable, the setting for IPsec tunnels (S612 / S613) or router mode.
Before putting the device into operation, you can first create the entire configuration offline
and then download it. For the first configuration (device with factory settings), use the MAC
address printed on the device.
Depending on the application, you will download the configuration to one or more modules
during the commissioning phase.
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Product properties and commissioning
2.3 Commissioning
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External
Internal
Figure 2-6
External
+XE6ZLWFK
Internal
Overview of commissioning
Factory defaults
With the factory defaults (settings as supplied or after resetting to factory defaults), the
SCALANCE S behaves as follows after turning on the power supply:
● IP communication is not possible since the IP settings are missing; the SCALANCE S
itself does not yet have an IP address.
As soon as the SCALANCE S module is assigned a valid IP address by the configuration,
the module is accessible even over routers (IP communication is then possible).
● The device has a fixed, default MAC address; the MAC address is printed on the device
and must be used during configuration.
● The firewall is preconfigured with the following basic firewall rules:
– Unsecured data traffic from internal port to external port and vice versa
(external ↔ internal) is not possible;
The unconfigured status can be recognized when the F LED is lit yellow.
See also
Product Characteristics (Page 17)
Installation (Page 26)
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Product properties and commissioning
2.3 Commissioning
2.3.1
Step 1: Connecting the SCALANCE S module
Follow the steps below:
1. First unpack the SCALANCE S and check that it is undamaged.
2. Connect the power supply to the SCALANCE S.
Result: After connecting the power, the Fault LED (F) is lit yellow.
3. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks).
Connect port 1 (external port) with the external network to which the configuration PC/PG
is connected.
Connect port 2 (internal port) with the internal network.
Note:
During commissioning, you can, in principle, initially connect the configuration PC/PG to
port 1 or port 2 and do without a connection to other network nodes until the device has
been supplied with a configuration. If you connect to port 2, however, you must configure
each individual SCALANCE S module separately!
4. Now continue with the next step "Configuring and downloading".
2.3.2
Step 2: Configuring and downloading
The section below describes how to configure the SCALANCE S module starting from the
factory settings.
Follow the steps below:
1. Start the supplied Security Configuration Tool.
2. Select the menu command Project ▶ New.
You will be prompted to enter a user name and a password. The user entry you specify
here will be assigned the role of an administrator.
3. Enter a user name and a password and confirm your entries to create a new project.
4. The "Selection of the module or software configuration" dialog is automatically displayed.
Now configure your product type, the module and the firmware release.
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Product properties and commissioning
2.3 Commissioning
5. In the box for the "MAC Address" in the "Configuration" area, enter the MAC address
printed on the module housing in the specified format.
You will find this address on the front of the SCALANCE S module (see figure).
6. Enter the external IP address and the external subnet mask in the relevant boxes in the
"Configuration" area and confirm the dialog with "OK". Your module will then be included
in the list of configured modules.
7. Select your module and, if necessary, enter the IP address of the default router by
clicking in the "Default Router" column.
Optional: Configure any other properties of the module and module groups if required.
8. Save the project under a suitable name with the following menu command:
Project ▶ Save As...
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Product properties and commissioning
2.4 C-PLUG (configuration plug)
9. Select the following menu command:
Transfer ▶ To Module...
The following transfer dialog opens.
10.If you click on the "Start" button, you transfer the configuration to the SCALANCE S
module.
Result: The SCALANCE S module is now configured and can communicate at the IP
level. This mode is indicated by the Fault LED being lit green.
2.4
C-PLUG (configuration plug)
Area of application
The C-PLUG is an exchangeable medium for storage of the configuration and project
engineering data of the basic device (SCALANCE S). This means that the configuration data
remains available if the basic device is replaced.
How it works
Power is supplied by the end device. The C-PLUG retains all data permanently when the
power is turned off.
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Product properties and commissioning
2.4 C-PLUG (configuration plug)
Inserting in the C-PLUG slot
The slot for the C-PLUG is located on the back of the device. You insert the C-PLUG as
follows:
1. Remove the M32 screw cover.
2. Insert the C-PLUG in the intended slot.
3. Then close the slot with the M32 screw cover.
NOTICE
Check the operating status
The C-PLUG may only be inserted or removed when the power is off!
Figure 2-7
Inserting the C-PLUG in the device and removing the C-PLUG from the device with a
screwdriver
Function
If an empty C-PLUG (factory settings) is inserted, all configuration data of the SCALANCE S
is saved to it when the device starts up. Changes to the configuration during operation are
also saved on the C-PLUG without any operator intervention being necessary.
A basic device with an inserted C-PLUG automatically uses the configuration data of the CPLUG when it starts up. This is, however, only possible when the data was written by a
compatible device type.
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Product properties and commissioning
2.4 C-PLUG (configuration plug)
This allows fast and simple replacement of the basic device. If a device is replaced, the CPLUG is taken from the failed component and inserted in the replacement. After it has
started up, the replacement device has the same device configuration as the failed device.
Note
Consistent project data - adapting the MAC address
After replacing the device with a spare, the project engineering data should be consistent. To
achieve this, you should adapt the MAC address from the project engineering to the MAC
address printed on the replacement device.
If you use the previously configured C_PLUG of the device you are replacing, this is not
absolutely necessary to start up and run the device.
NOTICE
Reset to factory settings
If a C-PLUG is plugged in when you reset to factory settings, the C-PLUG is erased!
Using a previously written C-PLUG
Use only C-PLUGs that are formatted for the relevant SCALANCE S module type. C-PLUGs
that have already been used in other device types and formatted for these device types must
not be used.
The following table shows which C-PLUG you can use for which SCALANCE S module type:
SCALANCE S module
type
C-PLUG formatted by
S602
S602
x
-
-
S612
-
x
x *)
S613
-
x
x
x
C-PLUG can be used with the module type
-
C-PLUG cannot be used with the module type
*)
Compatibility depends on configuration limits.
S612
S613
Removing the C-PLUG
It is only necessary to remove the C-PLUG if the basic device fails (hardware fault).
NOTICE
Check the operating status
The C-PLUG may only be removed when the power is off!
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Product properties and commissioning
2.5 Transferring firmware
Diagnostics
Inserting a C-PLUG that does not contain the configuration of a compatible device type,
inadvertently removing the C-PLUG, or general malfunctions of the C-PLUG are indicated by
the diagnostic mechanisms of the end device (fault LED red).
2.5
Transferring firmware
You can download new firmware versions to the SCALANCE S modules using the Security
Configuration Tool.
Requirements
To transfer new firmware to a SCALANCE S module, the following conditions must be met:
● You must have administrator permissions for the project;
● SCALANCE S must already have been configured with an IP address.
The transfer is secure
The firmware is transferred over a secure connection and can therefore also be transferred
from the unprotected network.
The firmware itself is signed and encrypted. This ensures that only authentic firmware can be
downloaded to the SCALANCE S module.
The transfer can take place during operation
The firmware can be transferred while a SCALANCE S module is in operation.
Communication is, however, interrupted after the download until the automatic restart of the
SCALANCE S is completed. Newly downloaded firmware only becomes active after the
SCALANCE S module has been restarted.
If the transfer is disturbed and aborted, the module starts up again with the old firmware
version.
How to make the transfer
Select the following menu command:
Transfer ▶ Firmware Update...
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GETTING STARTED
3
Getting results fast with GETTING STARTED
Based on a simple test network, this chapter shows you how to work with SCALANCE S and
the Security Configuration Tool. You will soon see that you can implement the security
functions of SCALANCE S in the network without any great project engineering effort.
Working through the chapter, you will be able to implement the basic functions SCALANCE
S/ SOFTNET Security Client based on various security examples:
● With SCALANCE S612 / S613:
– Configuring a VPN with SCALANCE S modules as IPsec tunnel endpoints
– Configuring a VPN with SCALANCE S modules and SOFTNET Security Client as
IPsec tunnel endpoints
● With all SCALANCE S modules:
– Configuring SCALANCE S as a firewall;
– Configuring SCALANCE S as NAT/NAPT router and firewall
● With SOFTNET Security Client
– Configuring a VPN with SCALANCE S modules and SOFTNET Security Client as
IPsec tunnel endpoints
– Configuring a VPN with MD741-1 and SOFTNET Security Client as IPsec tunnel
endpoints
If you want to know more
You will find more detailed information in the next chapters of this manual. They describe the
entire functionality in detail.
Note
The IP settings in the examples are freely selected and do not cause any conflicts in the
isolated test network.
In a real network, you would need to adapt these IP settings to avoid possible address
conflicts.
SCALANCE S and SOFTNET Security Client
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39
GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
3.1
Example 1: VPN tunnel - IPsec tunnel example with SCALANCE
S612 / S613
3.1.1
Overview
In this example, the tunnel function is configured in the "standard mode" project engineering
view. SCALANCE S module 1 and SCALANCE S module 2 are the two tunnel endpoints for
the secure tunnel connection in this example.
With this configuration, IP traffic and layer 2 traffic (bridge mode only) is possible only over
the established tunnel connections with authorized partners.
Setting up the test network
PC3
PC1
PC2
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● Internal network - attachment to SCALANCE S port 2 ("internal network" port)
In the test setup, in the internal network, the network node is implemented in each case
by one PC connected to the "internal network" port (port 2, green) of a SCALANCE S
module.
– PC1: Represents a node in internal network 1
– PC2: Represents a node in internal network 2
– SCALANCE S module 1: SCALANCE S module for internal network 1
– SCALANCE S module 2: SCALANCE S module for internal network 2
● External network - attachment to SCALANCE S port 1 ("external network" port)
The public external network is attached to the "external network" port (port 1, red) of a
SCALANCE S module.
PC3: PC with the Security Configuration Tool
SCALANCE S and SOFTNET Security Client
40
Operating Instructions, 02/2011, C79000-G8976-C196-07
GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
Required devices/components:
Use the following components to set up to the network:
● 2 x SCALANCE S modules, (optional: one or two suitably installed standard rails with
fittings);
● 1 x or 2 x 24 V power supplies with cable connections and terminal block plugs (both
modules can also be operated from a common power supply);
● 1 x PC on which the "Security Configuration Tool" is installed;
● 2 x PCs in the internal networks to test the configuration;
● 1 x network hub or switch to set up the network connections with the two SCALANCE S
modules and the PCs/PGs;
● The required network cable, TP cable (twisted pair) complying with the IE FC RJ-45
standard for Industrial Ethernet.
Overview of the next steps:
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3.1.2
Set up SCALANCE S and the network
Follow the steps outlined below:
1. First unpack the SCALANCE S devices and check that they are undamaged.
2. Connect the power supply to the SCALANCE S.
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
Result: After connecting the power, the Fault LED (F) is lit yellow.
WARNING
The SCALANCE S is designed for operation with safety extra-low voltage. This means that
only safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit to supply the SCALANCE S must comply with NEC Class 2 (voltage
range 18 - 32 V, current requirement approx. 250 mA).
When installing and connecting the SCALANCE S modules, refer to Chapter 2 "Product
characteristics and commissioning".
1. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks):
– Connect PC1 with port 2 of module 1 and PC2 with port 2 of module 2.
– Connect port 1 of module 1 and port 1 of module 2 with the hub/switch.
– Connect PC3 to the hub/switch as well.
2. Now turn on the PCs.
NOTICE
The Ethernet attachments at port 1 and port 2 are handled differently by the SCALANCE
S and must not be swapped over when connecting to the communication network:
 Port 1 - external network
Upper RJ-45 jack, marked red = unprotected network area;
 Port 2 - internal network
Lower RJ-45 jack, marked green = network protected by SCALANCE S;
If the ports are swapped over, the device loses its protective function.
3.1.3
Make the IP settings for the PCs
For the test, the PCs should be given the following IP address settings:
PC
IP address
Subnet mask
PC1
191.0.0.1
255.255.0.0
PC2
191.0.0.2
255.255.0.0
PC3
191.0.0.3
255.255.0.0
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
Follow the steps below for PC1, PC2, and PC3:
1. On the relevant PC, open the Control Panel with the following menu command:
Start ▶ Control Panel
2. Click "Network and Sharing Center" and select the "Change Adapter Settings" option in
the navigation menu on the left.
3. In the "Local Area Connection Properties" dialog, enable the "Internet Protocol Version 4
(TCP/IPv4)" check box and click the "Properties" button.
4. In the "Internet Protocol Version 4 (TCP/IPv4) Properties" dialog, select the "Use the
following IP address" radio button: and enter the values assigned to the PC from the table
"Make the IP setting of the PCs" in the respective fields.
Close the dialogs with "OK" and exit the Control Panel.
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
3.1.4
Create the project and modules
Follow the steps below:
1. Start the Security Configuration Tool on PC3.
2. Create a new project with the following menu command:
Project ▶ New
You will be prompted to enter a user name and a password. The user entry you specify
here will be assigned the role of an administrator.
3. Enter a user name and a password and confirm your entries to create a new project.
4. The "Selection of the module or software configuration" dialog is automatically displayed.
Now configure your product type, the module and the firmware release and close the
dialog with "OK".
5. Create a second module with the following menu command:
Insert ▶ Module
Now configure your product type, the module and the firmware release and close the
dialog with "OK".
This module is automatically given a name according to the defaults for the project along
with default parameter values. The IP address is incremented from "Module1" and is
therefore different.
6. In the navigation area, click on "All Modules" and then on the row with "Module1" in the
content area.
7. Now click on the "MAC Address" column and enter the MAC address in the specified
format.
You will find this address on the front panel of the SCALANCE S module (see figure).
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
8. Now click on the "IP Address ext." column and enter the IP address in the specified
format and adapt the subnet mask accordingly.
– For module 1: IP address: 191.0.0.201 subnet mask: 255.255.0.0
– For module 2: IP address: 191.0.0.202 subnet mask: 255.255.0.0
9. Repeat steps 6 through 8 for "Module 2".
3.1.5
Configuring a tunnel connection
Two SCALANCE S modules can establish one IPsec tunnel for secure communication when
they are assigned to the same group in the project.
Follow the steps below:
1. Select "All Groups" in the navigation area and create a new group with the following
menu command:
Insert ▶ Group
This group is automatically given the name "Group1".
2. Select the SCALANCE S module "Module1" in the content area and drag it to "Group1" in
the navigation area.
The module is now assigned to this group (is a member of the group).
The color of the key symbol of the module icon changes from gray to blue.
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
3. Select the SCALANCE S module "Module2" in the content area and drag it to the
"Group1" in the navigation area.
The module is now also assigned to this group.
4. Save this project under a suitable name with the following menu command:
Project ▶Save As...
The configuration of the tunnel connection is now complete.
3.1.6
Download the configuration to the SCALANCE S module
Follow the steps below:
1. Using the menu command below, open the following dialog:
Transfer ▶ To All Modules...
2. Select the two modules using the "Select All" button.
3. Start the download with the "Start" button.
If the download was completed free of errors, the SCALANCE S is restarted automatically
and the new configuration activated.
Result: SCALANCE S in productive operation
The SCALANCE S is now in productive operation. This mode is indicated by the Fault LED
being lit green.
The configuration has now been commissioned and the two SCALANCE S modules can now
establish a communication tunnel over which network nodes from the two internal networks
can communicate.
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GETTING STARTED
3.1 Example 1: VPN tunnel - IPsec tunnel example with SCALANCE S612 / S613
3.1.7
Test the tunnel function (ping test)
How can you test the configured function?
The function can be tested as described below using a ping command.
As an alternative, you can also use other communication programs to test the configuration.
NOTICE
In Windows, the firewall can be set so that as default the PING commands do not pass
through. If necessary, you will need to enable the ICMP services of the type Request and
Response.
Test phase 1
Now test the function of the tunnel connection established between PC1 and PC2:
1. Open the following menu command from the taskbar Start menu on PC2:
Start ▶ All Programs ▶ Accessories ▶ Command Prompt
2. Enter the Ping command from PC1 to PC2 (IP address 191.0.0.2)
In the command line of the "Command Prompt" window, enter the following command
ping 191.0.0.2
.
You will then receive the following message: (positive reply from PC2).
Result
If the IP packets have reached PC2, the "Ping statistics for 191.0.0.2" display the following:
● Sent = 4
● Received = 4
● Lost = 0 (0% loss)
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
Since no other communication is permitted, these packets must have been transported
through the VPN tunnel.
Test phase 2
Now repeat the test by sending a ping command from PC3.
1. Open the following menu command from the taskbar Start menu on PC3:
Start ► All Programs ► Accessories ► Command Prompt
2. Send the same ping command (ping 191.0.0.2) in the Command Prompt window of PC3.
You will then receive the following message: (no reply from PC2).
Result
The IP frames from PC3 cannot reach PC2 since neither tunnel communication between
these two devices is configured nor is normal IP data traffic permitted.
This is shown in the "Ping statistics" for 191.0.0.2 as follows:
● Sent = 4
● Received = 0
● Lost = 4 (100% loss)
3.2
Example 2: Firewall - Operating a SCALANCE S as a firewall
3.2.1
Overview
In this example, the firewall is configured in the "standard mode" project engineering view.
The standard mode includes predefined sets of rules for data traffic.
With this configuration, IP traffic can only be initiated from the internal network; only the
response is permitted from the external network.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
Setting up the test network
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● Internal network - attachment to SCALANCE S port 2
In the test setup, in the internal network, the network node is implemented by one PC
connected to the "internal network" port (port 2, green) of a SCALANCE S module.
– PC2: Represents a node in the internal network
– SCALANCE S module 1: SCALANCE S module for the internal network
● External network - attachment to SCALANCE S port 1
The public external network is attached to the "external network" port (port 1, red) of a
SCALANCE S module.
– PC1: PC with the Security Configuration Tool
Required devices/components:
Use the following components to set up to the network:
● 1 x SCALANCE S module, (additional option: a suitably installed DIN rail with fittings)
● 1 x 24 V power supply with cable connector and terminal block plug
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
● 1 x PC on which the Security Configuration Tool is installed
● 1 x PC in the internal network to test the configuration
● The required network cable, TP cable (twisted pair) complying with the IE FC RJ-45
standard for Industrial Ethernet
Overview of the next steps:
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3.2.2
Set up SCALANCE S and the network
Follow the steps below:
1. First unpack the SCALANCE S and check that it is undamaged.
2. Connect the power supply to the SCALANCE S.
Result: After connecting the power, the Fault LED (F) is lit yellow.
WARNING
The SCALANCE S is designed for operation with safety extra-low voltage. This means that
only safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit to supply the SCALANCE S must comply with NEC Class 2 (voltage
range 18 - 32 V, current requirement approx. 250 mA).
When installing and connecting the SCALANCE S modules, refer to Chapter 2 "Product
characteristics and commissioning"
SCALANCE S and SOFTNET Security Client
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
3. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks):
– Connect PC2 with port 2 of module 1.
– Connect PC1 with port 1 of module 1.
4. Now turn on the PCs.
NOTICE
The Ethernet attachments at port 1 and port 2 are handled differently by the SCALANCE
S and must not be swapped over when connecting to the communication network:
 Port 1 - external network
Upper RJ-45 jack, marked red = unprotected network area;
 Port 2 - Internal Network
Lower RJ-45 jack, marked green = network protected by SCALANCE S;
If the ports are swapped over, the device loses its protective function.
3.2.3
Make the IP settings for the PCs
For the test, the PCs should be given the following IP address settings:
PC
IP address
Subnet mask
PC1
191.0.0.1
255.255.0.0
PC2
191.0.0.2
255.255.0.0
Follow the steps below for PC1 and PC2:
1. On the relevant PC, open the Control Panel with the following menu command:
Start ▶ Control Panel
2. Click "Network and Sharing Center" and select the "Change Adapter Settings" option in
the navigation menu on the left.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
3. In the "Local Area Connection Properties" dialog, enable the "Internet Protocol Version 4
(TCP/IPv4)" check box and click the "Properties" button.
4. In the "Internet Protocol Version 4 (TCP/IPv4) Properties" dialog, select the "Use the
following IP address" radio button: and enter the values assigned to the PC from the table
"Make the IP setting of the PCs" in the respective fields.
Close the dialogs with "OK" and exit the Control Panel.
3.2.4
Create the project and module
Follow the steps below:
1. Install and start the Security Configuration Tool on PC1.
2. Create a new project with the following menu command:
Project ▶ New
You will be prompted to enter a user name and a password. The user entry you specify
here will be assigned the role of an administrator.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
3. Enter a user name and a password and confirm your entries to create a new project.
4. The "Selection of the module or software configuration" dialog is automatically displayed.
Now configure your product type, the module and the firmware release.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
5. In the box for the "MAC Address" in the "Configuration" area, enter the MAC address
printed on the module housing in the specified format.
You will find this address on the front of the SCALANCE S module (see figure).
6. Enter the external IP address also in the required format (191.0.0.200) and the external
subnet mask (255.255.0.0) and confirm the dialog with "OK". Your module will then be
included in the list of configured modules.
3.2.5
Configure the firewall
In standard mode, the firewall can be set simply with predefined sets of rules. You can
activate these sets of rules by clicking on them.
Follow the steps below:
1. Select the "Module1" row in the content area.
2. Select the following menu command:
Edit ▶ Properties…
3. Select the "Firewall" tab in the displayed dialog.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
4. Enable the option shown below:
This means that IP traffic can only be initiated from the internal network; only the
response is permitted from the external network.
5. You should also select the Logging options to record data traffic.
6. Close the dialog with "OK".
7. Save this project under a suitable name with the following menu command:
Project ▶ Save As...
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
3.2.6
Download the configuration to the SCALANCE S module
Follow the steps below:
1. Select the module in the content area.
2. Select the following menu command:
Transfer ▶ To Module…
3. Start the download with the "Start" button.
If the download was completed free of errors, the SCALANCE S module is restarted
automatically and the new configuration activated.
Result: SCALANCE S in productive operation
The SCALANCE S is now in productive operation. This mode is indicated by the Fault LED
being lit green.
Commissioning the configuration is now complete and the SCALANCE S is now protecting
the internal network (PC2) with the firewall according to the configured rule: "Allow IP traffic
from internal to external network".
3.2.7
Test the firewall function (ping test)
How can you test the configured function?
The function can be tested as described below using a ping command.
As an alternative, you can also use other communication programs to test the configuration.
NOTICE
In Windows, the firewall can be set so that as default the PING commands do not pass
through. If necessary, you will need to enable the ICMP services of the type Request and
Response.
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
Test phase 1
Now test the function of the firewall configuration, first with allowed outgoing IP data traffic as
follows:
1. Open the following menu command from the taskbar Start menu on PC2:
Start ▶ All Programs ▶ Accessories ▶ Command Prompt
2. Enter the Ping command from PC2 to PC1 (IP address 191.0.0.1)
In the command line of the "Command Prompt" window, enter the following command:
ping 191.0.0.1
You will then receive the following message: (positive reply from PC1).
Result
If the IP packets have reached PC1, the "Ping statistics for 191.0.01" display the following:
● Sent = 4
● Received = 4
● Lost = 0 (0% loss)
Due to the configuration, the ping packets can pass from the internal network to the external
network. The PC in the external network has replied to the ping packets. Due to the "stateful
inspection" function of the firewall, the reply packets arriving from the external network are
automatically passed into the internal network.
Test phase 2
Now test the function of the firewall configuration with blocked outgoing IP data traffic as
follows:
1. Now reopen the firewall dialog as described above.
2. Deselect the "Allow IP traffic from internal to external network" box in the "Firewall
Settings" tab.
Close the dialog with "OK".
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GETTING STARTED
3.2 Example 2: Firewall - Operating a SCALANCE S as a firewall
3. Now download the modified configuration to the SCALANCE S module again.
4. If the downloading is completed free of errors, enter the same ping command again (ping
191.0.0.1) in the Command Prompt window of PC2 as described above.
You will then receive the following message: (no reply from PC1).
Result
The IP packets from PC2 now cannot reach PC1 since the data traffic from the "internal
network" (PC2) to the "external network" (PC1) is not permitted.
This is shown in the "Ping statistics for 191.0.0.1" as follows:
● Sent = 4
● Received = 0
● Lost = 4 (100% loss)
3.2.8
Log firewall data traffic
On the SCALANCE S, the local logging of system, audit and packet filter events is enabled
as default.
While working through this example, you also activated the logging options when configuring
the firewall.
You can therefore display the recorded events in online mode.
Follow the steps below:
1. Now change to online mode on PC1 in the Security Configuration Tool with the following
menu command:
View ▶ Online
2. Select the following menu command:
Edit ▶ Online Diagnostics...
3. Select the "Packet Filter Log" tab.
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GETTING STARTED
3.3 Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router
4. Click the "Start Reading" button.
5. Acknowledge the displayed dialog with OK.
Result: The log entries are read from the SCALANCE S and displayed here.
3.3
Example 3: Firewall and router - Operating a SCALANCE S as a
firewall and router
3.3.1
Overview
In this example, you configure the NAT router mode. You configure in the "advanced mode"
configuration view.
With the configuration introduced here, you have the situation that all the packets sent from
the internal subnet to the PC1 node in the external network are allowed to pass the firewall.
The packets are forwarded to the outside with an IP address transformed to the IP address
of the SCALANCE S and with a dynamically assigned port number.
Only the replies to these packets is allowed to pass from the external network.
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GETTING STARTED
3.3 Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router
Setting up the test network
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Internal
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● Internal network - attachment to SCALANCE S port 2
In the test setup, in the internal network, the network node is implemented by one PC
connected to the "internal network" port (port 2, green) of a SCALANCE S module.
– PC2: Represents a node in the internal network
– SCALANCE S module 1: SCALANCE S module for the internal network
● External network - attachment to SCALANCE S port 1
The public external network is attached to the "external network" port (port 1, red) of a
SCALANCE S module.
PC1: PC with the Security Configuration Tool
Required devices/components:
Use the following components to set up to the network:
● 1 x SCALANCE S module, (additional option: a suitably installed DIN rail with fittings);
● 1 x 24 V power supply with cable connector and terminal block plug;
● 1 x PC on which the Security Configuration Tool is installed;
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3.3 Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router
● 1 x PC in the internal network to test the configuration;
● The required network cable, TP cable (twisted pair) complying with the IE FC RJ-45
standard for Industrial Ethernet.
Overview of the next steps:
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3.3.2
Set up SCALANCE S and the network
Follow the steps below:
1. First unpack the SCALANCE S and check that it is undamaged.
2. Connect the power supply to the SCALANCE S.
Result: After connecting the power, the Fault LED (F) is lit yellow.
WARNING
The SCALANCE S is designed for operation with safety extra-low voltage. This means that
only safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit to supply the SCALANCE S must comply with NEC Class 2 (voltage
range 18 - 32 V, current requirement approx. 250 mA).
When installing and connecting the SCALANCE S modules, refer to Chapter 2 "Product
characteristics and commissioning"
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GETTING STARTED
3.3 Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router
3. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks):
– Connect PC2 with port 2 of module 1.
– Connect PC1 with port 1 of module 1.
4. Now turn on the PCs.
NOTICE
The Ethernet attachments at port 1 and port 2 are handled differently by the SCALANCE
S and must not be swapped over when connecting to the communication network:
 Port 1 - External Network
Upper RJ-45 jack, marked red = unprotected network area;
 Port 2 - Internal Network
Lower RJ-45 jack, marked green = network protected by SCALANCE S;
If the ports are swapped over, the device loses its protective function.
3.3.3
Make the IP settings for the PCs
For the test, the PCs should be given the following IP address settings:
PC
IP address
Subnet mask
Default gateway
PC1
192.168.10.100
255.255.255.0
192.168.10.1
PC2
172.10.10.100
255.255.255.0
172.10.10.1
For standard gateway, you specify the IP addresses that will be assigned to the SCALANCE
S module for the internal and external interface in the subsequent project engineering:
● PC1 uses the external interface.
● PC2 uses the internal interface.
Follow the steps below for PC1 and PC2:
1. On the relevant PC, open the Control Panel with the following menu command:
Start ▶ Control Panel
2. Click "Network and Sharing Center" and select the "Change Adapter Settings" option in
the navigation menu on the left.
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3. In the "Local Area Connection Properties" dialog, enable the "Internet Protocol Version 4
(TCP/IPv4)" check box and click the "Properties" button.
4. In the "Internet Protocol Version 4 (TCP/IPv4) Properties" dialog, select the "Use the
following IP address" radio button: and enter the values assigned to the PC from the table
"Make the IP setting of the PCs" in the respective fields.
Close the dialogs with "OK" and exit the Control Panel.
3.3.4
Create the project and module
Follow the steps below:
1. Install and start the Security Configuration Tool on PC1.
2. Create a new project with the following menu command:
Project ▶ New
You will be prompted to enter a user name and a password. The user entry you specify
here will be assigned the role of an administrator.
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3. Enter a user name and a password and confirm your entries to create a new project.
4. The "Selection of the module or software configuration" dialog is automatically displayed.
Now configure your product type, the module and the firmware release.
5. In the box for the "MAC address" in the "Configuration" area, enter the MAC address
printed on the module housing in the specified format.
You will find this address on the front panel of the SCALANCE S module (see figure).
6. Enter the external IP address also in the required format (192.168.10.1) and the external
subnet mask (255.255.255.0) and confirm the dialog with "OK". Your module will then be
included in the list of configured modules.
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3.3 Example 3: Firewall and router - Operating a SCALANCE S as a firewall and router
3.3.5
Configuring the NAT router mode
The common use case in which all internal nodes send packets to the external network and
keep their IP addresses hidden by the NAT functionality is preconditioned on the
SCALANCE S. As shown below, you can enable this behavior simply by clicking in routing
mode.
Enabling router mode - follow the steps below:
1. First change the configuration view to advanced mode.
2. Select the following menu command:
View ▶ Advanced Mode
3. Now double-click on the SCALANCE S module. This opens the dialog for setting the
module properties.
4. Select the "Routing Mode" tab in the displayed dialog.
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5. Select the "Routing active" option in the group box.
6. In the "Routing" group box, you now add the address information for the interface of the
SCALANCE S to the internal subnet:
– Internal module IP address: 172.10.10.1
– Internal subnet mask: 255.255.255.0
To enable NAT router mode for internal nodes - follow the steps below:
The next step is to configure the required address conversion for NAT mode.
1. Select the options "NAT active" and "Allow Internal > External for all users" in the NAT
group box.
You will see that an entry has been added to the end of the address conversion list in the
"NAT" group box. The "*" entry in the "internal IP address" column now stands for all
nodes in the internal network.
2. Close the dialog with "OK".
The only thing left to do is to make sure that the firewall allows the packets to pass from
internal to external.
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3.3.6
Configure the firewall
You now need to define a set of rules that allows the traffic from the internal node (PC2) to
the node in the external network (PC1).
The example also shows you how to define a global set of rules and assign it to a module. If
you then configure additional modules in the same project, you then simply need to assign
the defined set of rules to the other modules using drag and drop. This, of course, assumes
that the same rules apply.
To define a global rule set, follow the steps below:
1. Expand the "Global FW Rulesets" object and select "FW IP Rulesets".
2. Select the following menu command with the right mouse button:
Insert > Firewall rule set
3. Enter a rule set in the dialog as shown below:
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4. Click in the "Log" column in the row for the new rule set. This enables the packet filter
logging option. Packets to which the defined rule is applied are then logged.
You will use this log in the example shown here in the final test of the configuration.
5. Close the dialog with "OK".
To assign a global rule set, follow the steps below:
1. Select the "Module1" object in the navigation area and holding down the left mouse
button, drag it to the newly created global firewall rule set.
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2. You can check the assignment by reopening the dialog for setting the module properties
and selecting the "Firewall" tab.
You will see that the global firewall rule was saved there.
3. If you click the "Expand Rulesets" button, you can view the rule set in detail.
This completes offline configuration.
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3.3.7
Download the configuration to the SCALANCE S module
Follow the steps below:
1. Select the module in the content area.
2. Select the following menu command:
Transfer ▶ To Module…
3. Start the download with the "Start" button.
If the download was completed free of errors, the SCALANCE S module is restarted
automatically and the new configuration activated.
Result: SCALANCE S in productive operation
The SCALANCE S is now in productive operation. This mode is indicated by the Fault LED
being lit green.
Commissioning the configuration is now complete and the SCALANCE S is now protecting
the internal network (PC2) with the firewall according to the configured rule: "Allow outgoing
IP traffic" from the internal to the external network.
3.3.8
Test the NAT router function (ping test)
How can you test the configured function?
The function can be tested as described below using a ping command. To be able to
recognize the effects of the NAT router mode, use the packet filter logging on the firewall
interface.
A reminder: In the definition of the global firewall rule, you have already enabled the packet
filter logging option.
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Note on the ping command: As an alternative, you can also use other communication
programs to test the configuration.
NOTICE
In Windows, the firewall can be set so that as default the PING commands do not pass
through. If necessary, you will need to enable the ICMP services of the type Request and
Response.
Test part 1 - sending the ping command
Now test the function of the NAT router mode in IP data traffic from internal to external as
follows:
1. Open the following menu command from the taskbar Start menu on PC2:
Start ▶ All Programs ▶ Accessories ▶ Command Prompt
2. Enter the ping command from PC2 to PC1 (IP address 192.168.10.100)
In the command line of the "Command Prompt" window, enter the following command:
ping 192.168.10.100
You will then receive the following message: (positive reply from PC1).
Test part 2 - evaluating the result
1. Now change to the online mode of the Security Configuration Tool. Select the following
menu command:
View ▶ Online
2. Select the module you want to edit and then select the following menu command to open
the online dialog
Edit ▶ Online Diagnostics...
Select the "Packet Filter Log" tab.
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3. Click the "Start Reading" button.
4. Acknowledge the displayed dialog with "OK".
Result: The log entries are read from the SCALANCE S and displayed here.
Result
You will see the following in the log output:
● Output row 1
The IP addresses of the packets from PC2 to PC1 are displayed on the interface to the
external network with the external IP address of the SCALANCE S module
(192.168.10.01). This matches the expected address conversion (note: the additional port
assignment is not shown here).
● Output row 2
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3.4 Example 4: Remote access - VPN tunnel example with SCALANCE S612 / S613 and SOFTNET Security Client
The reply packets are displayed with the destination address of the node in the internal
subnet (PC2: 172.10.10.100). You can see that the address conversion had already
taken place before the reply packet passed the firewall.
3.4
Example 4: Remote access - VPN tunnel example with SCALANCE
S612 / S613 and SOFTNET Security Client
3.4.1
Overview
In this example, the VPN tunnel function is configured in the "standard mode" configuration
view. In this example, a SCALANCE S and the SOFTNET Security Client form the two tunnel
endpoints for the secure tunnel connection via a public network.
With this configuration, IP traffic is possible only over the established VPN tunnel
connections with authorized partners.
Setting up the test network
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3.4 Example 4: Remote access - VPN tunnel example with SCALANCE S612 / S613 and SOFTNET Security
Client
● Internal network - attachment to SCALANCE S port 2 ("internal network" port)
In the test setup, in the internal network, a network node is implemented by one PC
connected to the "internal network" port (port 2, green) of a SCALANCE S module.
– PC1: Represents a node in the internal network
– SCALANCE S module 1: SCALANCE S module for protection of the internal network
● External, public network - attachment to SCALANCE S port 1 ("external network" port)
The external public network is attached to the "external network" port (port 1, red) of a
SCALANCE S module.
– PC2: PC with Security Configuration Tool configuration software and the SOFTNET
Security Client software for secure VPN access to the internal network
– PC3: Test PC for test phase 2
Note
In the example, a local area network is used as a substitute for an external public WAN to
illustrate the principles of the functionality.
Explanations relating to the use of a WAN are provided where necessary.
Required devices/components:
Use the following components to set up to the network:
● 1 x SCALANCE S module, (optional: a suitably installed DIN rail with fittings);
● 1 x 24 V power supply with cable connector and terminal block plug;
● 1 x PC on which the "Security Configuration Tool" and VPN client "SOFTNET Security
Client" are installed;
● 1 x PC in the internal network to test the configuration;
● 1 x PC in the external network to test the configuration;
● 1 x network hub or switch to set up the network connections with the SCALANCE S
module and the PCs;
● The required network cable, TP cable (twisted pair) complying with the IE FC RJ-45
standard for Industrial Ethernet.
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3.4 Example 4: Remote access - VPN tunnel example with SCALANCE S612 / S613 and SOFTNET Security Client
Overview of the next steps:
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3.4.2
Set up SCALANCE S and the network
Follow the steps outlined below:
1. First unpack the SCALANCE S device and check that it is undamaged.
2. Connect the power supply to the SCALANCE S module.
Result: After connecting the power, the Fault LED (F) is lit yellow.
WARNING
The SCALANCE S is designed for operation with safety extra-low voltage. This means that
only safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit to supply the SCALANCE S must comply with NEC Class 2 (voltage
range 18 - 32 V, current requirement approx. 250 mA).
When installing and connecting the SCALANCE S modules, refer to Chapter 2 "Product
characteristics and commissioning".
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3.4 Example 4: Remote access - VPN tunnel example with SCALANCE S612 / S613 and SOFTNET Security
Client
1. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks):
– Connect PC1 with port 2 of module 1.
– Connect port 1 of module 1 with the hub/switch.
– Connect PC2 and PC3 to the hub/switch as well.
2. Now turn on the PCs.
Note
To use a WAN as an external public network, the connections to the hub/switch must be
replaced by the connections to the WAN (Internet access).
NOTICE
The Ethernet attachments at port 1 and port 2 are handled differently by the SCALANCE
S and must not be swapped over when connecting to the communication network:
 Port 1 - "external network"
Upper RJ-45 jack, marked red = unprotected network area;
 Port 2 - "internal network"
Lower RJ-45 jack, marked green = network protected by SCALANCE S;
If the ports are swapped over, the device loses its protective function.
3.4.3
Make the IP settings for the PCs
For the test, the PCs should be given the following IP address settings.
PC
IP address
Subnet mask
Default gateway
PC1
192.168.0.1
255.255.255.0
192.168.0.201
PC2
191.0.0.2
255.255.0.0
191.0.0.201
PC3
191.0.0.3
255.255.0.0
191.0.0.201
For standard gateway, you specify the IP addresses that will be assigned to the SCALANCE
S module for the internal and external interface in the subsequent project engineering:
● PC1 uses the internal interface.
● PC2 and PC3 use the external interface.
Note
To use a WAN as an external public network, the relevant IP settings for the connection
to the WAN (Internet) must be made on PC2 and PC3.
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Follow the steps below for PC1, PC2, and PC3:
1. On the relevant PC, open the Control Panel with the following menu command:
Start ► Control Panel
2. Click "Network and Sharing Center" and select the "Change Adapter Settings" option in
the navigation menu on the left.
3. In the "Local Area Connection Properties" dialog, enable the "Internet Protocol Version 4
(TCP/IPv4)" check box and click the "Properties" button.
4. In the "Internet Protocol Version 4 (TCP/IPv4) Properties" dialog, select the "Use the
following IP address" radio button: and enter the values assigned to the PC from the table
"Make the IP setting of the PCs" in the respective fields.
Close the dialogs with "OK" and exit the Control Panel.
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Client
3.4.4
Create the project and modules
Follow the steps outlined below:
1. Start the Security Configuration Tool on PC2.
2. Create a new project with the following menu command:
Project ▶ New
You will be prompted to enter a user name and a password. The user entry you specify
here will automatically be assigned the role of an administrator.
3. Enter a user name and a password and confirm your entries to create a new project.
4. The "Selection of the module or software configuration" dialog is automatically displayed.
Now configure your product type, the module and the firmware release and close the
dialog with "OK".
5. Create a second module with the following menu command:
Insert ► Module
Now configure the product type "SOFTNET Configuration", the "SOFTNET Security
Client" module and the firmware release of your SOFTNET Security Client version and
then close the dialog with "OK".
This module is automatically given a name according to the defaults for the project.
6. In the navigation area, click on "All Modules" and then on the row with "Module1" in the
content area.
7. Now click on the "MAC Address" column and enter the MAC address in the specified
format.
You will find this address on the front panel of the SCALANCE S module (see figure).
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8. Now click on the "IP Address ext." column and enter the IP address in the specified
format and adapt the subnet mask accordingly.
For module 1: IP address: 191.0.0.201, subnet mask: 255.255.0.0
Note
To use a WAN as an external public network, enter the static IP address you received
from your provider as the "IP Address ext." via which the SCALANCE S module will then
be accessible in the WAN (Internet).
Before the SCALANCE S module can send packets in the WAN (Internet), you will need
to enter your DSL router as the "Default Router".
If you use a DSL router as Internet gateway, the following ports (at least) must be
forwarded on it:
• Port 500 (ISAKMP)
• Port 4500 (NAT-T)
For configuration downloads (not through an active tunneL), port 443 (HTTPS) must also
be forwarded.
9. Now open the properties menu of "Module1" by right-clicking on the entry and selecting
the "Properties..." menu command.
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Client
10.Now activate routing mode as shown below in the "Routing Mode" tab, enter the internal
IP address (192.168.0.201) and the subnet mask (255.255.255.0) of the SCALANCE S
module and confirm with "OK".
11.In the navigation area, click on "All Modules" and then on the row with "Module2" in the
content area.
12.Click in the "Name" column and enter the name "SSC-PC2".
The SOFTNET Security Client does not require any further settings.
Your screen should now resemble the following screenshot.
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3.4.5
Configuring a tunnel connection
A SCALANCE S and the SOFTNET Security Client can establish one IPsec tunnel for
secure communication when they are assigned to the same group in the project.
Follow the steps outlined below:
1. Select "All Groups" in the navigation area and create a new group with the following
menu command:
Insert ► Group
This group is automatically given the name "Group1".
2. Select the SCALANCE S module "Module1" in the content area and drag it to "Group1" in
the navigation area.
The module is now assigned to this group (is a member of the group).
The color of the key symbol of the module icon changes from gray to blue.
3. Select the SOFTNET Security Client in the content area and drag it to "Group1" in the
navigation area.
The module is now also assigned to this group.
4. Save this project under a suitable name with the following menu command:
Project ► Save As...
The configuration of the tunnel connection is now complete.
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Client
3.4.6
Loading the configuration on the SCALANCE S and saving the SOFTNET
Security Client configuration
Follow the steps outlined below:
1. Using the menu command below, open the following dialog:
Transfer ► To All Modules...
2. Start the download with the "Start" button.
3. Save the configuration file "projectname.SSC-PC2.dat" in your project folder and assign a
password for the private key of the certificate.
If the download was completed free of errors, the SCALANCE S is restarted automatically
and the new configuration activated.
Result: SCALANCE S in productive operation
The SCALANCE S is now in productive operation. This mode is indicated by the Fault LED
being lit green.
The configuration has now been commissioned and the SCALANCE S module and the
SOFTNET Security Client can now establish a communication tunnel over which network
nodes from the two internal networks can communicate securely with PC2 from within the
internal network.
Note
To use a WAN as an external public network, you cannot configure a SCALANCE S module
with the factory settings via the WAN. In this case, configure the SCALANCE S module from
within the internal network.
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3.4.7
Set up a tunnel with the SOFTNET Security Client
Follow the steps outlined below:
1. Start the SOFTNET Security Client on PC2.
2. Click the "Load Configuration" button, change to your project folder and load the
"Projectname.SSC-PC2.dat" configuration file.
3. Enter the password for the private key of the certificate and confirm with "Next".
4. Confirm the "Enable all statically configured nodes?" dialog with "Yes".
5. Click the "Tunnel Overview" button.
Result: Active tunnel connection
The tunnel between SCALANCE S and SOFTNET Security Client was established. This
status is indicated by the green circle beside the "Module1" entry.
In the log console of the tunnel overview of the SOFTNET Security Client, you can see
several messages from your system indicating what happened during the connection attempt
and whether or not a policy for the communication connection was created.
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Client
The configuration has now been commissioned and the SCALANCE S module and the
SOFTNET Security Client have established a communication tunnel over which network
nodes can communicate securely with PC2 from within the internal network.
3.4.8
Test the tunnel function (ping test)
How can you test the configured function?
The function can be tested as described below using a ping command.
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As an alternative, you can also use other communication programs to test the configuration.
NOTICE
In Windows, the firewall can be set so that as default the PING commands do not pass
through. If necessary, you will need to enable the ICMP services of the type Request and
Response.
Test phase 1
Now test the function of the tunnel connection established between PC1 and PC2:
1. Open the following menu command from the taskbar Start menu on PC2:
Start ► All Programs ► Accessories ► Command Prompt
2. Enter the ping command from PC2 to PC1 (IP address 192.168.0.1).
In the command line of the "Command Prompt" window, enter the following command
ping 192.168.0.1
.
You will then receive the following message: (positive reply from PC1).
Result
If the IP packets have reached PC1, the "Ping statistics for 192.168.0.1" display the
following:
● Sent = 4
● Received = 4
● Lost = 0 (0% loss)
Since no other communication is permitted, these packets must have been transported
through the VPN tunnel.
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3.5 Example 5: Remote access - VPN tunnel example with MD741-1 and SOFTNET Security Client
Test phase 2
Now repeat the test by sending a ping command from PC3.
1. Open the following menu command from the taskbar Start menu on PC3:
Start ► All Programs ► Accessories ► Command Prompt
2. Send the same ping command (ping 192.168.0.1) in the Command Prompt window of
PC3.
You will then receive the following message: (no reply from PC1).
Result
The IP frames from PC3 cannot reach PC1 since neither tunnel communication between
these two devices is configured nor is normal IP data traffic permitted.
This is shown in the "Ping statistics" for 192.168.0.1 as follows:
● Sent = 4
● Received = 0
● Lost = 4 (100% loss)
3.5
Example 5: Remote access - VPN tunnel example with MD741-1
and SOFTNET Security Client
3.5.1
Overview
In this example, the VPN tunnel function is configured in the "advanced mode" project
engineering view. An MD741-1 and the SOFTNET Security Client form the two tunnel
endpoints for the secure tunnel connection via a public network.
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3.5 Example 5: Remote access - VPN tunnel example with MD741-1 and SOFTNET Security Client
With this configuration, IP traffic is possible only over the established VPN tunnel connection
with authorized partners.
Note
To configure this example, you need a public, fixed IP address from your provider (mobile
wireless provider) for the SIM card of the MD741-1 that can also be reached from the
Internet.
(As an alternative, it is also possible to work with a DynDNS address for the MD741-1.)
Setting up the test network:
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● Internal network - attachment to MD741-1 port X2 ("internal network")
In the test setup, in the internal network, a network node is implemented by a PC
connected to the "internal network" port (port X2) of an MD741-1 module.
– PC1: Represents a node in the internal network
– MD741-1: MD741-1 module for protection of the internal network
External, public network - connection via MD741-1 antenna ("external network")
The external, public network must be a GSM or mobile wireless network that can be
selected by the user at the provider (mobile wireless provider) and is reached via the
antenna of the MD741-1.
– PC2: PC with Security Configuration Tool configuration software and the SOFTNET
Security Client software for secure VPN access to the internal network
Required devices/components:
Use the following components to set up to the network:
● 1 x MD741-1 module with SIM card, (optional: a suitably installed DIN rail with fittings);
● 1 x 24 V power supply with cable connector and terminal block plug;
● 1 x PC on which the "Security Configuration Tool" and VPN client "SOFTNET Security
Client" are installed;
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● 1 x PC in the internal network of the MD741-1 with a browser for configuring the MD741-1
and testing the configuration;
● 1 x DSL router (connection to the Internet for the PC with the VPN client (ISDN, DSL,
UMTS etc.))
● The required network cable, TP cable (twisted pair) complying with the IE FC RJ-45
standard for Industrial Ethernet.
Overview of the next steps
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3.5.2
Setting up the MD741-1 and the network
Follow the steps outlined below:
1. First unpack the MD741-1 device and check that it is undamaged.
2. Follow the step-by-step commissioning as described in the MD741-1 system manual up
to the point at which you need to set it up to suit your own requirements. To do this, use
PC1; for setting up the MD741, refer to the section Configuring the MD741-1 (Page 94).
3. Now establish the physical network connections by plugging the network cable
connectors into the ports being used (RJ-45 jacks):
– Connect PC1 with Port X2 ("internal network") of the MD741-1
– Connect PC2 with the DSL router
4. Now turn on the PCs.
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3.5.3
Make the IP settings for the PCs
For the test, the PCs should be given the following IP address settings.
PC
IP address
Subnet mask
Default gateway
PC1
192.168.1.101
255.255.255.0
192.168.1.1
PC2
192.168.2.202
255.255.255.0
192.168.2.1
Under Default gateway for PC1, specify the IP address that you will assign to the MD741-1
module (for the internal network interface) in the subsequent configuration. For PC2, specify
the IP address of the DSL router (for the internal network interface).
Follow the steps below with PC1 and PC2 to open the network connections on the relevant PC:
1. On the relevant PC, open the Control Panel with the following menu command:
Start ► Control Panel
2. Open the "Network and Sharing Center" icon.
3. In the "Local Area Connection Properties" dialog, enable the "Internet Protocol Version 4
(TCP/IPv4)" check box and click the "Properties" button.
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4. In the "Internet Protocol Version 4 (TCP/IPv4) Properties" dialog, select the "Use the
following IP address" radio button: off. Now enter the values assigned to the PC from the
table "Make the IP settings for the PCs" in the relevant boxes.
Close the dialogs with "OK" and exit the Control Panel.
3.5.4
Create the project and modules
Follow the steps outlined below:
1. Start the Security Configuration Tool on PC2.
2. Create a new project with the following menu command:
Project ▶ New
You will be prompted to enter a user name and a password. The user entry you specify
here will automatically be assigned the role of an administrator.
3. Enter a user name and a password and confirm your entries to create a new project.
The "Selection of a module or software configuration" dialog opens automatically.
4. Now configure the product type "SOFTNET Configuration (SOFTNET Security Client,
MD74x)", the module "SOFTNET Security Client", the firmware version "V3.0" and assign
the module name "SSC-PC2".
5. Close the dialog with "OK".
6. Create a second module with the following menu command:
Insert ► Module
Now configure the product type "SOFTNET Configuration (SOFTNET Security Client,
MD74x)", the module "MD74x" and assign the module name "MD741-1".
7. Now click on the "IP Address (ext.)" box in the "Configuration" area and enter the IP
address in the specified format. Configure the corresponding external subnet mask as
well.
Note
To configure this example, you need a public, fixed IP address from your provider (mobile
wireless provider) for the SIM card of the MD741-1 that can also be reached from the
Internet. Enter this IP address as the external IP address for your module.
If you work with dynamic addresses for the MD741-1, you require a DynDNS address for
the module. In this case, you do not need to adapt the external IP address at this point.
The IP address entered therefore serves simply as a placeholder.
When configuring the SOFTNET Security Client later, specify a DNS name instead of an
external IP address.
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8. Now click on the "IP Address (int.)" box in the "Configuration" area and enter the IP
address in the specified format. (IP address: 192.168.1.1) Configure the corresponding
internal subnet mask as well. (Subnet mask: 255.255.255.0)
9. Now close the dialog with "OK".
You obtain a view similar to that in the following figure.
3.5.5
Configuring a tunnel connection
An MD741-1 and the SOFTNET Security Client can establish one IPsec tunnel for secure
communication when they are assigned to the same group in the project.
Follow the steps outlined below:
1. Select "All Groups" in the navigation area and create a new group with the following
menu command:
Insert ► Group
This group is automatically given the name "Group1".
2. Select the MD741-1 module "MD741-1" in the content area and drag it to "Group1" in the
navigation area.
The module is now assigned to this group (is a member of the group).
The color of the key symbol of the module icon changes from gray to blue. Which
indicates that an IPsec connection was configured for the module.
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3. Select the SOFTNET Security Client module "SSC-PC2" in the content area and drag it to
"Group1" in the navigation area.
The module is now also assigned to this group.
4. Now change your project to advanced mode with the following menu command:
View ► Advanced Mode
5. Open the group properties of Group1 by selecting the "Properties..." shortcut menu.
6. Change the SA Life for Phase 1 and Phase 2 to 1440 minutes and leave all other settings
at their default values.
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NOTICE
A successful tunnel connection between MD741-1 and the SOFTNET Security Client
can only be established if you keep exactly to the parameters listed below.
If you use different parameter settings, it is possible that the two tunnel partners will not
be able to set up a VPN connection between them.
Authentication method: Certificate
Advanced Settings Phase 1:
 IKE Mode: Main




Phase 1 DH Group: Group2
Phase 1 Encryption: 3DES-168
SA Life (minutes): 1440
Phase 1 Authentication: SHA1
Advanced Settings Phase 2:
 SA Lifetype: Time
 Phase 2 Encryption: 3DES-168
 SA Life (minutes): 1440
 Phase 2 Authentication: SHA1
7. Save this project under a suitable name with the following menu command:
Project ► Save As...
The configuration of the tunnel connection is now complete.
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3.5.6
Saving the configuration of the MD741-1 and the SOFTNET Security Client
Follow the steps outlined below:
1. Using the menu command below, open the following dialog:
Transfer ► To All Modules...
2. Start the download with the "Start" button.
3. Save the configuration file "projectname.SSC-PC2.dat" in your project folder and assign a
password for the private key of the certificate. The following files will be saved in your
project directory:
– "Projectname.SSC-PC2.dat"
– "Projectname.string.SSC-PC2.p12"
– "Projectname.group1.cer"
4. Save the configuration file "projectname.MD741-1.txt" in your project folder and assign a
password for the private key of the certificate. The following files will be saved in your
project directory:
– "projectname.MD741-1.txt"
– "projectname.string.MD741-1.p12"
– "projectname.group1.MD741-1.cer"
You have now saved all the necessary files and certificates and can put the MD741-1 and
the SOFTNET Security Client into operation.
3.5.7
Configuring the MD741-1
The using the saved text file "projectname.MD741-1.txt" you can create the configuration of
the MD741-1 very simply based on its Web-based management. Below, this example shows
you the configuration of the MD741-1 step-by-step.
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The following is assumed for the configuration:
● MD741-1 has a public, fixed IP address that can be reached via the Internet;
● The SOFTNET Security Client has a dynamic IP address assigned by the provider.
At the relevant points, you will also be given information about configuring a DynDNS name
for the MD741-1.
Follow the steps outlined below:
1. Connect to the Web user interface of the MD741-1 via PC1.
Note: If the MD741-1 has its factory settings, the internal interface of the module has the
IP address 192.168.1.1
2. Go to the following directory:
IPsec VPN ► Certificates
3. You saved the required certificates on PC2 in the last section and assigned a password
for the private key. Transfer the certificates ("projectname.string.MD741-1.p12",
"projectname.group1.MD741-1.cer") for the MD741-1 initially to PC1.
4. Now upload the certificates of the partners (projectname. group1.MD741-1.cer" and the
PKCS 12 file "projectname.string.MD741-1.p12" to the module.
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VPN Roadwarrior mode of the MD741-1
Since the SOFTNET Security Client has a dynamic IP address, the VPN Roadwarrior mode
of the MD741-1 is used to establish a secure connection.
● Roadwarrior mode of the MD741-1:
– In the VPN Roadwarrior mode, the SINAUT MD741-1 can accept VPN connections
from partners with an unknown address. These can, for example, be mobile partners
that obtain their IP address dynamically.
– The VPN connection must be established by the partner. Only one VPN connection is
possible in Roadwarrior mode. VPN connections in standard mode can be operated at
the same time.
Follow the steps outlined below:
1. Go to the following directory:
IPsec VPN ► Connections
2. Edit the settings of the Roadwarrior VPN as shown in the following figure and save your
entries.
You can get the "Remote ID" from the "projectname.MD741-1.txt" text file. As an option,
you can enter the "Remote ID" here.
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3. Edit the IKE settings of the Roadwarrior VPN as shown in the following figure and save
your entries.
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NOTICE
A successful tunnel connection between MD741-1 and the SOFTNET Security Client
can only be established if you keep exactly to the parameters listed below.
If you use different parameter settings, the two tunnel partners will not be able to set up
a VPN connection between them. You should therefore always keep to the settings in
the exported text file (as shown extra below).
Authentication method: X.509 partner certificate
Phase 1 - ISKAMP SA:
 ISAKMP-SA encryption:3DES-168
 ISAKMP-SA hash: SHA-1
 ISAKMP-SA mode: Main mode
 ISAKMP-SA Lifetime (seconds): 86400
Phase 2 - IPSec SA:
 IPSec SA encryption: 3DES-168
 IPSec SA hash: SHA-1
 IPSec SA lifetime (seconds): 86400
DH/PFS group: DH-2 1024
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4. To be able to use the diagnostics function of the SOFTNET Security Client for
successfully established VPN tunnels in conjunction with the MD741-1, you need to allow
a ping from the external network of the MD741-1.
To do this, go to the directory:
Security ► Advanced Settings
Set the "External ICMP to the MD741-1" function to the value "Allow Ping" and save your
entry. Note also the following figure.
Note
If you do not enable this function, you will not be able to use the diagnostics function of
the SOFTNET Security Client for successfully established VPN tunnels in conjunction
with the MD741-1. You then do not receive any feedback as to whether the tunnel was
successfully established but can nevertheless communicate securely via the tunnel.
5. To allow you to access the Web interface of the MD741-1 module via the external
interface as well, enable the HTTPS remote access.
This gives you the opportunity of configuring and diagnosing the MD741-1 remotely via
an established tunnel.
To do this, go to the directory:
Access ► HTTPS
Set in the "Enable HTTPS remote access" function to the value "Yes" as shown in the
following figure and save your entry.
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Note
If you want to access the MD741-1 using a DNS name, make the settings for the
DynDNS server connection in the following directory:
External Network ► Advanced Settings ► DynDNS
1. Change the setting "Log on to to DynDNS server" to the value "Yes".
2. Specify your username and the password of your DynDNS account.
3. Enter the full DynDNS address in the "DynDNS hostname" box. Remember to specify
the domain for this address as well. (Example: "mydns.dyndns.org")
The commissioning of the MD741-1 module is now complete. The module and the
SOFTNET Security Client can establish a communication tunnel over which network nodes
can communicate securely with PC2 from within the internal network.
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3.5.8
Setting up a tunnel with the SOFTNET Security Client
Follow the steps outlined below:
1. Start the SOFTNET Security Client on PC2.
2. Click the "Load Configuration" button, change to your project folder and load the
"Projectname.SSC-PC2.dat" configuration file.
3. For an MD741-1 configuration, the SOFTNET Security Client opens the dialog "IP-/DNS
settings MD741-1". In this dialog, enter the public IP address of the MD741-1 module that
you received from your provider. Confirm the dialog with "OK".
Note: If you work with a DNS name, you can configure this instead of an IP address in
this dialog.
4. Enter the password for the certificate and confirm with "Next".
5. Confirm the "Enable all statically configured nodes?" dialog with "Yes".
6. Click the "Tunnel Overview" button.
Note
If you want to reach the MD741-1 module using a DNS name, set the full DynDNS
address in the "DNS Name" input box in step 3. (Example: "mydns.dyndns.org")
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Result: Active tunnel connection
The tunnel between MD741-1 and SOFTNET Security Client was established.
The blue icon beside the "MD741-1" entry indicates that a policy was created for this
communication connection.
Accessibility of the MD741-1 is indicated by the 'green circle' beside the "MD741-1" entry.
Note
Remember that this function depends on enabling the ping function on the MD741-1 module.
In the Logging Console of the tunnel view of the SOFTNET Security Client, you will see
additional feedback from your system from which you can deduce the following:
● How did the connection attempt go?
● Was the policy created for your communication connection?
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The commissioning of the configuration is now complete. The MD741-1 module and the
SOFTNET Security Client have established a communication tunnel over which network
nodes can communicate securely with PC2 from within the internal network.
3.5.9
Test the tunnel function (ping test)
How can you test the configured function?
The function is tested as described below using a ping command.
As an alternative, you can also use other communication programs to test the configuration.
NOTICE
In Windows, the firewall can be set so that as default the ping commands do not pass
through. If necessary, you will need to enable the ICMP services of the type Request and
Response.
Testing
Now test the function of the tunnel connection established between PC1 and PC2:
1. Open the following menu command from the taskbar Start menu on PC2:
Start ► All Programs ► Accessories ► Command Prompt
2. Enter the ping command from PC2 to PC1 (IP address 192.168.1.101).
In the command line of the "Command Prompt" window, enter the following command
Ping 192.168.1.101
.
You will then receive the following message: (positive reply from PC1).
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Result
If the IP packets have reached PC1, the "Ping statistics for 192.168.1.101" display the
following:
● Sent = 4
● Received = 4
● Lost = 0 (0 % loss)
Since no other communication is permitted, these packets must have been transported
through the VPN tunnel.
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Configuring with the Security Configuration Tool
4
The Security Configuration Tool is the configuration tool is supplied with SCALANCE S.
This chapter will familiarize you with the user interface and the functionality of the
configuration tool.
You will learn how to set up, work with, and manage SCALANCE S projects.
Further information
How to configure modules and IPsec tunnels is described in detail in the next chapters of this
manual.
You will find detailed information on the dialogs and parameter settings in the online help.
You can call this with the F1 key or using the "Help" button in the relevant dialog.
F1
4.1
Range functions and how they work
Scope of performance
You use the Security Configuration Tool for the following tasks:
● Configuration of SCALANCE S
● Configuration of SOFTNET Security Client (S612 / S613 / MD 741-1)
● Creating the configuration data for MD 740-1 / MD 741-1
● Test and diagnostic functions, status displays
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Configuring with the Security Configuration Tool
4.1 Range functions and how they work
Modes
The Security Configuration Tool has two modes:
● Offline - configuration view
In offline mode, you create the configuration data for the SCALANCE S modules and
SOFTNET Security Clients. Prior to downloading, there must already be a connection to
a SCALANCE S.
● Online
The online mode is used for testing and diagnostics of a SCALANCE S.
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Two operating views
The Security Configuration Tool provides two operating views in offline mode:
● Standard mode
Standard mode is the default mode in the Security Configuration Tool. It allows fast,
uncomplicated configuration of SCALANCE S operation.
● Advanced mode
Advanced mode provides extended options allowing individual settings for the firewall
rules and security functionality.
How it works - security and consistency
● Access only for authorized users
You can protect each project from unauthorized access by assigning passwords.
● Consistent project data
Consistency checks are running even while you make the entries in the dialogs. You can
also start a project-wide consistency check for all dialogs at any time.
Only consistent project data can be downloaded.
● Protecting project data by encryption
The saved project and configuration data are protected by encryption both in the project
file and on the C-PLUG.
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4.2 Installation
4.2
Installation
You install the Security Configuration Tool from the supplied SCALANCE S CD.
Requirements
The prerequisites for installation and operation of the Security Configuration Tool on a
PC/PG are as follows:
● Operating system Windows XP SP2 or SP3 (not Home), Windows 7 (not Home);
● PC/PG with at least 128 Mbytes of RAM and a 1 GHz CPU or faster.
Follow the steps below
NOTICE
Before you install the Security Configuration Tool, make sure that you read the "README"
file on the CD. This file contains important notes and any late modifications.
● Insert the SCALANCE S CD in your CD-ROM drive; if the Autorun function is active, the
user interface with which you make the installation starts automatically.
or
● Start the "start.exe" application on the supplied SCALANCE S CD.
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4.3 User interface and menu commands
4.3
User interface and menu commands
Layout of the user interface
①
The navigation area functions as a project Explorer with the following main folders:

Global firewall rules
The node contains the configured global firewall rule sets. Other folders:

–
IP rule set
–
MAC rule set
All Modules
The node contains the configured SCALANCE S modules or SOFTNET Security Clients of the project.

All Groups
The "All Groups" node contains all created VPNs.
When you select an object in the navigation area, you will see detailed information on this object in the content
area.
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4.3 User interface and menu commands
②
Content area:
When you select an object in the navigation area, you will see detailed information on this object in the content
area.
Several parameters can be entered here.
③
By double clicking on the objects, you open properties dialogs in which you can enter further parameters.
Status bar
The status bar displays operating states and current status messages; these include:

The current user and user type

The operator view - standard mode/advanced mode

The mode - online/offline
Menu bar
Below, you will see an overview of the available menu commands and their meaning.
Menu command
Meaning / remarks
Project ▶…
Functions for project-specific settings and for downloading and
saving the project file.
New
Create a new project
Open…
Open the existing project.
Save
Save the open project in the current path and under the current
project name.
Save As…
Save the open project in a selectable path and under a selectable
project name.
Properties…
Open dialog for project properties.
Recent Projects
Allows you to select previously opened projects directly.
Shortcut
Quit
Edit ▶…
Note:
If you have selected an object, some of the functions listed here
are also available in the popup menu available with the right
mouse button.
Copy
Copy the selected object.
Ctrl+C
Paste
Fetch object from the clipboard and paste.
Ctrl+V
Delete
Delete the selected object.
Del
Rename
Rename the selected object.
F2
Properties
Open the properties dialog for the selected object.
F4
Online Diagnostics…
Access test and diagnostic functions.
This menu command is only available in the online view.
Insert ▶…
Module
(Menu commands only in offline mode)
Create new module.
Ctrl+M
The menu command is enabled only when a module object or a
group is selected in the navigation area.
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4.3 User interface and menu commands
Menu command
Meaning / remarks
Shortcut
Group
Create new group.
Ctrl+G
The menu command is enabled only when a group object is
selected in the navigation area.
Firewall rule set
Create a new globally valid set of firewall IP rules or MAC rules.
Ctrl+F
The menu command is enabled only when a firewall object is
selected in the navigation area.
Transfer ▶…
To Module…
Download data to the selected modules.
To All Modules…
Download data to all configured modules.
Note: Only consistent project data can be downloaded.
Note: Only consistent project data can be downloaded.
Configuration Status…
Display configuration status of the configured modules in a list.
Firmware Update...
Download new firmware to the selected SCALANCE S.
View ▶…
Advanced mode
Ctrl+E
Switch from the standard to the advanced mode.
Notice: If you switch to the advanced mode for the current project,
you can only switch back as long as you have made no
modifications.
The standard mode is the default.
Offline
Is the default.
Ctrl+Shift+D
Online
Ctrl+D
Options ▶…
IP Service Definitions …
Open a dialog for service definitions for IP firewall rules.
This menu command is only available in the "advanced mode"
view.
MAC Service
Definitions…
Open a dialog for service definitions for MAC firewall rules.
Change Project
Password...
Function for changing the user password.
Network adapter...
Function for selecting the local network adapter over which a
connection will be established to a SCALANCE S.
Log Files…
This menu command is only available in the "advanced mode"
view.
Displays log files.
Log files can be read and logs can be started.
Symbolic Names...
You can assign symbolic names for IP addresses or MAC
addresses.
Consistency checks
Check the consistency of the entire project. A result list is
displayed.
Help ▶…
Contents ...
Help on the functions and parameters required in the Security
Configuration Tool.
Ctrl+Shift+F1
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4.4 Managing projects
Menu command
Meaning / remarks
Shortcut
Index...
Help on the functions and parameters required in the Security
Configuration Tool.
Ctrl+Shift+F2
Info...
Information on the version and revision of the Security
Configuration Tool.
4.4
Managing projects
4.4.1
Overview
SCALANCE S project
A project in the Security Configuration Tool includes all the configuration and management
information for one or more SCALANCE S devices, SOFTNET Security Clients and MD74x
devices.
You create a module for each SCALANCE S device, each SOFTNET Security Client and
each MD74x device in the project.
Generally, the configurations of a project contain the following:
● Valid settings throughout the project
● Settings for specific modules
● Group assignments for IPsec tunnel (S612 / S613 / SOFTNET Security Client)
User management also handles access permissions to the project data and therefore to the
SCALANCE S devices.
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Valid settings throughout the project
● Project properties
These include not only address and name information but also initialization values and
authentication settings.
● Global firewall rules
Global firewall rules can be assigned to several modules at the same time. In many
situations, this simplifies the configuration compared with configuring local sets of firewall
rules in the settings for specific modules.
● Service definitions
Using the IP service definitions, you can define succinct and clear firewall rules.
Settings for specific modules
Most functions are configured in the properties dialog of a module. Here, you will find an
overview of the tabs available and their functions:
Function / tab in the properties dialog
Specified in mode ...
Standard
Advanced
X
X
X
X
Network
Here, you can specify addresses of any routers in your network.
Firewall
In standard mode, you enable the firewall with simple standard
rules. You can also enable logging settings here.
In advanced mode, you can define detailed packet filter rules.
You can also define explicit logging settings for each packet
filter rule.
SSL certificates
When necessary, for example with a compressed certificate,
you can import a certificate or use the Security Configuration
Tool to create a new certificate.
X
Time synchronization
Here, you specify the type of synchronization for the date and
time.
X
X
Logging
Here, you can make more precise settings for recording and
storing logged events.
X
Nodes
For a module in bridge mode, you can configure the static
internal subnets and internal IP/MAC nodes here and enable or
disable the learning of internal nodes.
X
For a module in routing mode, you can enter the internal nodes
/ complete subnets to be tunneled.
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Function / tab in the properties dialog
Specified in mode ...
Standard
Advanced
VPN
If the module is in a group, you can configure dead peer
detection, the type of connection establishment and the WAN
IP address here.
X
Routing mode
In standard mode, you can enable the "Router" function here.
X
X
In advanced mode, you can also enable the NAT/NAPT router
function and specify the address conversion in a list.
DHCP server
You can enable the module as a DHCP server for the internal
network.
X
You will find a detailed description of this function in the section "Firewall, routers and other
module properties".
Group assignments for IPsec tunnel (S612 / S613 / SOFTNET Security Client)
These specify which SCALANCE S modules, SOFTNET Security Clients and MD74x
modules can communicate with each other over an IPsec tunnel.
By assigning SCALANCE S modules, SOFTNET Security Clients and MD74x modules to a
group, these modules can establish a communication tunnel over a VPN (virtual private
network).
Only modules in the same group can communicate securely with each other over tunnels
and SCALANCE S modules, SOFTNET Security Clients and MD74x modules can belong to
several groups at the same time.
4.4.2
Creating and editing projects
How to create a project
Select the following menu command
Project ▶ New…
You will be prompted to assign a user name and a password. The user you create here is of
the type Administrator.
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As default, the Security Configuration Tool then creates a project and automatically opens
the "Selection of a module or software configuration" dialog in which you can configure your
first module.
Specifying initialization values for a project
With the initialization values, you specify the properties to be adopted when you create new
modules.
To enter the initialization values, select the following menu command:
Project ▶ Properties…, "Default Initialization Values" tab
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Protecting project data by encryption
The saved project and configuration data are protected by encryption both in the project file
and on the C-PLUG.
See also
Firewall, router and other module properties (Page 129)
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4.4.3
Setting up users
User types and permissions
Access to projects and SCALANCE S modules is managed by configurable user settings.
SCALANCE S recognizes two user types with different permissions:
● Administrators
With the "Administrator" user role, you have unrestricted access to all configuration data
and the SCALANCE S modules.
● User
With the "User" user role, you have the following access permissions:
– Read access to configurations; exception: You are not permitted to change your own
password.
– Read access to a SCALANCE S in the "Online" mode for testing and diagnostics.
User authentication
The users of the project must authenticate themselves during access. For each user, you
can specify a password authentication.
NOTICE
Make sure that you keep your passwords safely.
If you forget your user passwords, you can no longer access the relevant project and its
configurations nor the SCALANCE S modules.
You can then only access the SCALANCE S modules by resetting them to factory settings;
however, you will lose the configurations.
Dialog for setting up users
Select the following menu command to set up users:
Project ▶ Properties…, "Authentication Settings" tab.
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Protection against accidental prevention of access
The system makes sure that always one user of the type "Administrator" is retained in a
project. This prevents access to a project being lost entirely by accidentally deleting yourself.
NOTICE
if the authentication settings are changed, the configuration must be downloaded to the
SCALANCE S modules again before the settings (for example, new users, password
changes) become active on the modules.
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4.4.4
Consistency checks
Overview
The Security Configuration Tool distinguishes between:
● Local consistency checks
● Project-wide consistency checks
Refer to the "Consistency check" sections of the dialog descriptions in the manual for
information on the rules that are checked during input in the dialogs.
Local consistency checks
A consistency check is local when it can be performed directly within a dialog. Checks can
be made during the following actions:
● After exiting a box
● After exiting a row in a table
● When you close the dialog with "OK"
Project-wide consistency checks
Project-wide consistency checks provide you with information on correctly configured
modules. Since continuous consistency checks throughout the project take too much time,
and because inconsistent project data is normally created in the project engineering stage of
a project, there is an automatic check only when the following actions are performed:
● When you save the project
● When you open the project
● Before you download a configuration
NOTICE
You can only download configuration data when the entire project is consistent.
How to start a project-wide consistency check
You can start a consistency check for an open project with the following menu command:
Options ▶ Check Consistency
The test result is output in the form of a list. The status bar also draws your attention to the
results of the consistency check if the project contains inconsistent data. By positioning the
mouse pointer in the status bar, you can then display the list.
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4.4.5
You can assign symbolic names for IP / MAC addresses.
Meaning and advantages
In a SCALANCE S project, you can assign symbolic names in a symbol table that stand for
IP addresses and MAC addresses.
This makes it simpler and more reliable when configuring the individual services.
Symbolic names within the project are taken into account by the following functions and can
be used during their configuration:
● Firewall
● NAT/NAPT router
● Syslog
● DHCP
Validity and uniqueness
The validity of the symbolic names specified in the symbol table is restricted to configuration
within a SCALANCE S project.
Each symbolic name must be assigned uniquely to a single IP address or MAC address
within the project.
Automatic entry of symbolic names in the symbol table
You can use symbolic names instead of IP addresses for the listed functions - for example,
when creating firewall rules - without these already being assigned in the symbol table
described here.
Symbolic names assigned in this way are automatically entered in the symbol table and can
be assigned at a later point in time. Within the framework of the consistency check, you will
be informed of missing assignments.
Dialog for assigning symbolic names
To avoid inconsistencies between an "IP address - symbolic name" assignment, and "MAC
address - symbolic name", the symbolic names are managed in a single symbol table.
You can open the symbol table with the following menu command:
Options ▶ Symbolic Names...
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Follow the steps below to include entries in the symbol table:
● New entries
1. Click the "Add" button to add a new symbolic name in the next free table row.
2. Enter the symbolic name so that it is DNS-compliant. 1)
3. Add either the IP address or the MAC address to the entry. You can also specify both
addresses.
Legend:
DNS-compliance according to RFC1035 involves the following rules:
- Restriction to 255 characters in total (letters, numbers, dash or period);
- The name must begin with a letter;
- The name may only end with a letter or a number;
- A separate name within the name, in other words a string between two periods may be a
maximum of 63 characters long;
- No special characters such as umlauts, brackets, underscores, slashes or spaces etc.
1)
● Automatic entries
If the symbolic name has already been assigned within the framework of a service, you will
find a corresponding entry in the symbol table.
1. Click on the input box for the IP address or for the MAC address.
2. Add either the IP address or the MAC address to the entry. You can also specify both
addresses.
If you delete an entry in the symbol table, the symbolic names used in the services remain.
In this case, the consistency check recognizes undefined symbolic names. This applies both
to manual as well as to automatically generated entries.
Tip:
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The use of the project-wide consistency check is especially practical for the symbol table
described here. Based on the list, you can recognize every inconsistency and correct it.
You can start a consistency check for an open project with the following menu command:
Options ▶ Check Consistency
Consistency check - these rules must be adhered to
Remember the following rules when making the entries.
Check / rule
Check made1)
locally
The assignment of a symbolic name to an IP or MAC address must be
unique in both directions.
project-wide
x
The symbolic names must be DNS-compliant. 2)
x
Each row of the symbol table must contain a symbolic name. Either an
IP address or a MAC address or both must be specified.
x
No symbolic names may be assigned to the IP addresses of the
SCALANCE S modules.
x
Symbolic names used in the project for IP or MAC addresses must be
included in the symbol table.
x
Inconsistencies can occur when entries in the symbol table are deleted
and not removed or corrected in the configuration dialogs.
Legend:
1)
Note the explanations in the section "Consistency checks".
DNS-compliance according to RFC1035 involves the following rules:
- Restriction to 255 characters in total (letters, numbers, dash or period);
- The name must begin with a letter;
- The name may only end with a letter or a number;
- A separate name within the name, in other words a string between two periods may be a
maximum of 63 characters long;
- No special characters such as umlauts, brackets, underscores, slashes or spaces etc.
2)
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4.5 Download the configuration to the SCALANCE S module
4.5
Download the configuration to the SCALANCE S module
The configuration data created offline is downloaded to the SCALANCE S modules available
on the network using suitable menu commands.
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4.5 Download the configuration to the SCALANCE S module
Requirements
● Ports
In principle, you can download the configuration data both over device port 1 or device
port 2.
Ideally, you should configure the modules of a group over the common external network
of these modules (device port 1).
If the configuration computer is located in an internal network, you must enable the IP
addresses of the other modules of the group explicitly in the firewall of this SCALANCE S
and configure this module first. (This procedure is only supported when all SCALANCE S
modules have already been assigned an IP address: see "Point note during initial
configuration")
NOTICE
Using multiple network adapters during initial configuration
If you operate more than one network adapter in your PC/PG, first select the network
adapter over which you can reach the SCALANCE S module prior to initial configuration.
Use the menu command "Options ▶ Network Adapter…"
● Operating state
Configurations can be downloaded while the SCALANCE S devices are operating. After
downloading, the devices are automatically restarted. Following the download, there may
be a short interruption in communication between the internal and external network.
NOTICE
Point note during initial configuration
As long as a module has not yet set IP parameters; in other words, prior to the first
configuration, there must be no router or SCALANCE S between the module and the
configuration computer.
NOTICE
Changing the PC port
If you swap a PC from the internal to the external interface of the SCALANCE S, access
from this PC to the SCALANCE S is blocked for approximately 10 minutes (security
function to defend against "ARP cache spoofing").
NOTICE
The project must be consistent
You can only download configuration data when the entire project is consistent. If there
is an inconsistency, a detailed check list is displayed.
Secure transfer
The data is transferred with a secure protocol.
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4.6 Configuration data for MD 740 / MD 741
Follow the steps below
To download, use the following alternative menu commands:
● Transfer ▶ To Module…
This transfers the configuration to all selected modules.
● Transfer ▶ To All Modules...
This transfers the configuration to all modules configured in the project.
Synchronizing configuration discrepancies
It is not possible to read back configuration data from the SCALANCE S module to the
project.
4.6
Configuration data for MD 740 / MD 741
Transferring to a module
You can generate your VPN information for the assignment of parameters to an MD 740-1 /
MD 741-1 using the Security Configuration Tool. Once you have generated files, you can
use them to configure the MD 740-1 / MD 741-1.
The following file types are generated:
● Export file with the configuration data
– File type: ".txt" file in ASCII format
– Contains the exported configuration information for the MD 740 / MD 741 including
information on the additionally generated certificates.
● Module certificate
– File type: ".p12" file
– The file contains the module certificate and the key material.
– Access is password protected.
● Group certificate
– File type: ".cer" file
The configuration files for the MD 740-1 / MD 741-1 can also be used to configure other VPN
client types that are not included in the module selection. Minimum requirement for the use
of these VPN clients is support of IPsec VPNs in tunnel mode.
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4.6 Configuration data for MD 740 / MD 741
Figure 4-1
Export file for MD 741-1
Note
No configuration files are transferred to the module. Only an ASCII file is generated with
which you can configure the MD 740-1 / MD 741-1. This is, however, only possible when the
module is located in at least one VPN group in which there is also a SCALANCE S module
or a SOFTNET Security Client V3.0.
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4.6 Configuration data for MD 740 / MD 741
Follow the steps below
1. Select the "MD 740-1" / "MD 741-1" module in the content area and then select Transfer
▶ To Module...
2. In the save dialog that then opens, enter the path and file name of the configuration file
and click "Save".
3. You will then be asked whether you want to create your own password for the two
created certificate files.
If you select "No", the name of the configuration is assigned as the password (for
example DHCP_without_Routing_02), not the project password.
If you select "Yes" (recommended), you enter your password in the next dialog.
Result: The files (and certificates) are stored in the folder you specify.
Note
After the files have been stored, a message reminds of the upwards compatibility of the
project. Projects stored, for example, with the Security Configuration Tool V2.1 cannot be
loaded with the Security Configuration Tool V2.
Note
For more information on the configuration of the MD 740-1 / MD 741-1, refer to the
system manual MD 741-1 / MD 740-1.
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Firewall, router and other module properties
5
This chapter familiarizes you with the procedures for creating modules and the possible
settings for the individual modules in a project. The main emphasis is on the settings for the
firewall function and NAT/NAPT function of SCALANCE S.
Note
S612/S613
The firewall settings you can make for the individual modules can also influence
communication handled over the IPSec tunnel connections in the internal network (VPN).
Further information
How to configure IPSec tunnels is described in detail in the next chapter of this manual.
You will find detailed information on the dialogs and parameter settings in the online help.
You can call this with the F1 key or using the "Help" button in the relevant dialog.
F1
NOTICE
Performance features and device types
Note which functions the device type you are using supports.
See also
Online functions - test, diagnostics, and logging (Page 219)
Hardware characteristics and overview of the functions (Page 17)
5.1
Overview / basics
5.1.1
SCALANCE S as firewall
Meaning
The firewall functionality of SCALANCE S has the task of protecting the internal network
from influences or disturbances from the external network. This means that; depending on
the configuration, only certain previously specified communication relations between network
nodes from the internal network and network nodes from the external network are allowed.
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5.1 Overview / basics
All network nodes located in the internal network segment of a SCALANCE S are protected
by its firewall.
The firewall functionality can be configured for the following protocol levels:
● IP firewall with stateful packet inspection;
● Firewall also for Ethernet "non-IP" frames according to IEEE 802.3; (Layer 2 frames)
● Bandwidth limitation
Firewall rules
Firewall rules rules for data traffic in the following directions:
● from the internal to the external network and vice versa;
● from the internal network into an IPsec tunnel and vice versa (S612/S613).
Project engineering
A distinction must be made between the two operating views:
● In standard mode, simple, predefined rules are used.
● In advanced mode, you can define specific rules.
In advanced mode, a further distinction must be made between local firewall rules and
global firewall rules for modules:
– Local firewall rules are always assigned to a module. They are configured in the
properties dialog of the modules.
– Global firewall rules can be assigned to several modules at the same time. This option
simplifies configuration in many situations.
With the aid of service definitions, you can also define firewall rules clearly in a compact
form. You can reference these service definitions both directly in the local firewall rules and
in the global firewall rule sets.
5.1.2
SCALANCE S as router
Meaning
By operating the SCALANCE S as a router, you connect the internal network with the
external network. The internal network connected by SCALANCE S therefore becomes a
separate subnet.
You have the following options:
● Routing - can be set in both standard and advanced mode
● NAT/NAPT routing - can be set in advanced mode
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Routing - can be set in both standard and advanced mode
Packets intended for an existing IP address in the subnets (internal or external) are
forwarded. The firewall rules for the direction of transmission also apply.
For this mode, you must also configure an IP address for the internal subnet.
Note: In contrast to the bridge mode of the SCALANCE S , VLAN tags are lost in routing
mode.
NAT/NAPT routing - can be set in advanced mode
In this mode, the IP addresses are also converted. The IP addresses of the devices in the
internal subnet are mapped to external IP addresses and are therefore not "visible" in the
external network.
For this mode, you configure the address conversion in a list. You assign an external IP
address to an internal IP address.
Depending on the method you want to use, the following applies to the assignment:
● NAT (Network Address Translation)
The following applies here: Address = IP address
● NAPT (Network Address Port Translation)
The following applies here: Address = IP address + port number
5.1.3
SCALANCE S as DHCP server
Meaning
You can operate SCALANCE S on the internal network as a DHCP server. This allows IP
addresses to be assigned automatically to the devices connected to the internal network.
The IP addresses are assigned either dynamically from an address band you have specified
or you can select a specific IP address for a particular device.
Project engineering
Configuration as a DHCP server is possible in the "advanced mode" view
5.2
Creating modules and setting network parameters
Creating modules
When you create a new project, the Security Configuration Tool opens the "Selection of a
module or software configuration" dialog in which you can configure your first module.
You can create further modules with the following menu commands:
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5.2 Creating modules and setting network parameters
Insert ▶ Module
As an alternative: Using the context menu with the "All Modules" object selected.
In the next step in this dialog, select your product type, the module and the firmware release.
Network settings of a module
The network settings of a module include the following:
● Address parameters of the module
● Addresses of external routers
Address parameters
You can configure some address parameters in the "Selection of a module or software
configuration" dialog when you create a module.
You can also enter the address parameters in the content area by selecting the "All
Modules" object in the navigation area:
The following properties of the modules are displayed in columns:
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Table 5- 1
IP parameters - "All Modules" selected
Property/column
Meaning
Number
Consecutive module number
Assigned automatically
Name
Technologically relevant module name.
Freely selectable
IP address ext.
IP address over which the device can be
reached in the external network, for
example for downloading the configuration.
Assigned as suitable in the network
Subnet mask ext.
Subnet mask
Assigned as suitable in the network
IP address int.
IP address over which the device can be
reached in the internal network when it is
configured as a router.
Assigned as suitable in the network
Subnet mask
Assigned as suitable in the network
Subnet mask int.
Comment/selection
The input box can be edited only when
router mode was enabled in the module
properties.
The input box can be edited only when
router mode was enabled in the module
properties.
Default Router
IP address of the router in the external
network
Assigned as suitable in the network
MAC address
Hardware address of the module
The MAC address is printed on the module
housing.
Type
Device type

Remember the additional MAC address
in routing mode (you will find more
information below this table).

SCALANCE S602

SCALANCE S612 V1

SCALANCE S612 V2

SCALANCE S613 V1

SCALANCE S613 V2

SOFTNET Security Client 2005

SOFTNET Security Client 2008

SOFTNET Security Client V3.0
 MD 74x
There is no "Properties dialog" for these
module types.
For MD 74x, you can set the IP addresses
and the subnet masks in the contents area.
Comment
Useful technological information on the
module and the subnet protected by the
module.
Freely selectable
Additional MAC address in routing mode
In routing mode, SCALANCE S uses an additional MAC address on the interface to the
internal subnet. This second MAC address is derived from the MAC address printed on the
device:
● MAC address (internal) = printed MAC address + 1
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5.2 Creating modules and setting network parameters
When operating in flat networks (bridge mode), the printed MAC address is valid both on the
internal and on the external interface.
The currently valid MAC addresses are displayed in the "Status" tab in the online dialog of
the Security Configuration Tool.
"Network / External Routers" dialog
Depending on the existing network structure, it is possible that you must specify further
routers in addition to the standard router.
Select the module you want to edit and then select the following menu command to set up
external routers:
Edit ▶ Properties..., "Network" tab.
Figure 5-1
"Network" dialog
See also
Overview of the functions in the online dialog (Page 220)
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5.3 Firewall - module properties in standard mode
5.3
Firewall - module properties in standard mode
5.3.1
Configure the firewall
Protection from disturbances from the external network
The firewall functionality of SCALANCE S has the task of protecting the internal network
from influences or disturbances from the external network. This means that only certain
previously specified communication relations between network nodes from the internal
network and network nodes from the external network are allowed.
With packet filter rules, you define whether the data traffic passing through is permitted or
restricted based on properties of the data packets.
With SCALANCE S612 / S613, the firewall can be used for encrypted (IPsec tunnel) and
unencrypted data traffic.
In standard mode, it is only possible to make settings for unencrypted data traffic.
Note
Routing mode
If you have enabled the routing mode for the SCALANCE S module, MAC rules are
irrelevant.
Dialog
Select the module you want to edit and then select the following menu command to set up
the firewall:
Edit ▶ Properties..., "Firewall" tab
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5.3 Firewall - module properties in standard mode
"Configuration" option group - predefined rules
NOTICE
Please remember that the risks increase the more options you enable.
The standard mode includes the following predefined rules for the firewall that you can select
in the "Configuration" input area:
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5.3 Firewall - module properties in standard mode
Table 5- 2
Predefined rules of the simple firewall
Rule/option
Function
Default
setting
Tunneled communication only
(S612/S613)
This is the default setting.
On
Tunnel communication only
With this setting, only encrypted IPsec data transfer is
permitted; only nodes in the internal networks of SCALANCE
S can communicate with each other.
This option can only be selected when the module is in a
group.
If this option is deselected, tunnel communication and the
type of communication selected in the other check boxes are
permitted.
Allow outgoing IP traffic
Allow outgoing IP traffic
Internal nodes can initiate a communication connection to
nodes in the external network. Only response packets from
the external network are passed on to the internal network.
Off
No communication connection can be initiated from the
external network to nodes in the internal network.
Allow outgoing S7 protocol
Allow outgoing S7 protocol
Internal nodes can initiate an S7 communication connection
Off
(S7 protocol - TCP/port 102) to nodes in the external network.
Only response packets from the external network are passed
on to the internal network.
No communication connection can be initiated from the
external network to nodes in the internal network.
Allow access to external DHCP
server
Allow access to external DHCP
server
Allow access to external NTP server
Allow access to external NTP server
Internal nodes can initiate a communication connection to a
DHCP server in the external network. Only the response
packets of the DHCP server are passed into the internal
network.
Off
No communication connection can be initiated from the
external network to nodes in the internal network.
Internal nodes can initiate a communication connection to an
NTP (Network Time Protocol) server in the external network.
Only the response packets of the NTP server are passed into
the internal network.
Off
No communication connection can be initiated from the
external network to nodes in the internal network.
Allow access to external SiClock
server
This option allows SiClock time-of-day frames from the
external network to the internal network.
Off
Internal nodes can initiate a communication connection to a
DNS server in the external network. Only the response
packets of the DNS server are passed into the internal
network.
Off
Allow access to external SiClock
server
Allow access to external DNS server
Allow access to external DNS server
(The option cannot
be used in routing
mode.)
No communication connection can be initiated from the
external network to nodes in the internal network.
Allow access from external or internal
nodes via DCP server
Allow access from external or internal
nodes via DCP server
The DCP protocol is used by the PST tool to set the IP
parameters (node initialization) of SIMATIC NET network
components.
This rule allows nodes in the external network to access
nodes in the internal network using the DCP protocol.
Off
(The option cannot
be used in routing
mode.)
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5.3 Firewall - module properties in standard mode
"Log" group - setting recording options
You can log the incoming and outgoing data traffic.
5.3.2
Firewall defaults
Response with defaults
The firewall defaults have been selected so that no IP data traffic is possible.
Communication between the nodes in the internal networks of SCALANCE S modules is
allowed only if you have configured an IPSec tunnel.
The following diagrams show the default settings in detail for the IP packet filter and the
MAC packet filter.
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Default setting for the IP packet filter
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All packet types from internal to external are blocked.
All packets from internal to SCALANCE S are allowed (only useful for HTTPS).
All packets from external to internal and to SCALANCE S are blocked (including ICMP echo request).
Frames of the following types are permitted from external sources (external nodes and external SCALANCE S) to
SCALANCE S:

HTTPS (SSL)

ESP protocol (encryption)

IKE (protocol for establishing the IPSec tunnel)

NAT Traversal (protocol for establishing the IPSec tunnel)
IP communication over an IPSec tunnel is allowed.
Frames of the type Syslog and NTP in the direction of external are allowed by SCALANCE S.
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Default setting for the MAC packet filter
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All packet types from internal to external are blocked.
All packets from internal to SCALANCE S are allowed.
ARP packets from internal to external are allowed.
All packets from external to internal and to SCALANCE S are blocked.
Packets from external to internal of the following types are allowed:

⑥
⑦
5.4
ARP with bandwidth limitation
Packets from external to SCALANCE S of the following types are allowed:

ARP with bandwidth limitation

DCP
MAC protocols sent through an IPSec tunnel are permitted.
Firewall - module properties in advanced mode
Advanced mode provides extended options allowing individual settings for the firewall rules
and security functionality.
Switch over to advanced mode
To use all the functions and menu commands described in section, switch over the mode:
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View ▶ Advanced Mode...
Note
If you switch to the advanced mode for the current project, you can no longer switch back if
you make any modifications.
Symbolic names are supported
You can also enter the IP addresses or MAC addresses as symbolic names in the functions
described below.
5.4.1
Configure the firewall
In contrast to the configuration of fixed packet filter rules in standard mode, you can
configure individual packet filter rules in the Security Configuration Tool in advanced mode.
You can set the packet filter rules in selectable tabs for the following protocols:
● IP protocol (layer 3)
● MAC protocol (layer 2)
If you do not enter any rules in the dialogs described below, the default settings apply as
described in the section "Firewall defaults".
Note
Routing mode
If you have enabled the routing mode for the SCALANCE S module, MAC rules are
irrelevant (dialogs are disabled).
Global and local definition possible
● Global firewall rules
A global firewall rule can be assigned to several modules at the same time. This option
simplifies configuration in many situations.
● Local firewall rules
A local firewall rule is assigned to a module. This is configured in the properties dialog of
a module.
Several local firewall rules and several global firewall rules can be assigned to a module.
In principle, the definition of global and local rules is identical. The following description
therefore applies to both methods.
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5.4.2
Global firewall rules
Application
Global firewall rules are configured outside the module at the project level. Just like the
modules, they are visible in the navigation area of the Security Configuration Tool.
By selecting a configured module and dragging it to the global firewall rule, you assign the
firewall rule to the module. This global firewall rule then appears automatically in the modulespecific list of firewall rules.
You can define firewall rules for the following:
● IP rule sets
● MAC rule sets
The following schematic illustrates the relationship between globally defined rule sets and
locally used rule sets.
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When are global firewall rules useful?
Global firewall rules are useful when you can define identical filter criteria for communication
with the external network for subnets protected by several SCALANCE S modules.
You should, however, remember that this simplified project engineering can lead to
unwanted results if the module assignment is incorrect. You should therefore always check
the module-specific local firewall rules in the result. Inadvertent assignment of a rule cannot
be detected in the automatic consistency check.
Global firewall rules are used locally - conventions
The following conventions apply when creating a global set of firewall rules and when
assigning them to a module.
● View in the Security Configuration Tool
Global firewall rules can only be created in the advanced mode setting.
● Priority
As default, locally defined rules have higher priority than global rules; newly assigned
global rules are therefore initially inserted at the bottom of the local rule list.
The priority can be changed by changing the position in the rule list.
● Granularity
Global firewall rules can only be assigned to a module as an entire set.
● Entering, changing or deleting rules
Global firewall rules cannot be edited in the local rule list of the firewall rules in the
module properties. They can only be displayed there and positioned according to the
required priority.
It is not possible to delete a single rule from an assigned set of rules. You can take the
entire set of rules out of the local rule list but this does not change the definition in the
global rule list.
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Creating and assigning global packet filter rules
If you want to define and assign a global firewall rule set, follow the steps below:
1. Select one of the following folders from the navigation area:
– Global FW Rulesets / FW IP Rulesets.
– Global FW Rulesets / FW MAC Rulesets.
2. Select the following menu command to set up a global rule set:
Insert ▶ Firewall rule set
3. Enter the firewall rules in the list one after the other; note the parameter description and
the evaluation in the following section or in the online help.
4. Assign the global firewall rule to the modules in which you want it to be used. You do this
by selecting a module in the navigation area and dragging it to the relevant global rule set
in the navigation area.
Result:
The global rule set is used by the selected module as a local rule set.
5.4.3
Setting local IP packet filter rules
Using the IP packet filter rules, you can filter IP packets such as UDP, TCP, ICMP packets.
Within an IP packet filter rule, you can also include service definitions and further restrict the
filter criteria. If you do not specify services, the IP packet filter rule applies to all services.
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Opening the dialog for local IP packet filter rules
Select the module you want to edit and then select the following menu command to set up
the firewall:
Edit ▶ Properties...
Entering IP packet filter rules
Enter the firewall rules in the list one after the other; note the following parameter description
and the examples in the following sections or in the online help.
Using global rule sets
Global rule sets you have assigned to the module are automatically entered in the local rule
set. These are initially at the end of the rule list and are therefore processed with lowest
priority. You can change the priority by changing the position of a local or global rule set in
the rule list.
The online help explains the meaning of the individual buttons.
F1
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5.4.4
IP packet filter rules
IP packet rules are processed based on the following evaluations:
● Parameters entered in the rule;
● Order and associated priority of the rule within the rule set.
Parameter
The configuration of an IP rule includes the following parameters:
Name
Meaning/comment
Available options / ranges of
values
Action
Allow/disallow (enable/block)

Allow
Allow packets according to
definition.

Drop
Block packets according to
definition.
Direction
Specifies the direction of data traffic

Internal → external
("Tunnel / Any" only for S612/S613)

Internal ← external

Tunnel → internal

Tunnel ← internal

Internal → any

Internal ← any
Source IP
Source IP address
Destination IP
Destination IP address
Refer to the section "IP
addresses in IP packet filter
rules" in this chapter.
As an alternative, you can enter
symbolic names.
Service
Name of the IP/ICMP service or service group used.
Using the service definitions, you can define succinct and clear
packet filter rules.
Here, you select one of the services you defined in the IP
services dialog:
 IP services
or
The drop-down list box displays
the configured services and
service groups you can select.
No entry means: No service is
checked, the rule applies to all
services.
 ICMP services
If you have not yet defined any services or want to define a
further service, click the "IP/MAC Service Definition..." button.
Bandwidth (Mbps)
Option for setting a bandwidth limitation.
Range of values:
A packet passes through the firewall if the pass rule matches and 0.001 to 100 Mbps
the permitted bandwidth for this rule has not yet been exceeded.
Logging
Enable or disable logging for this rule
Comment
Space for your own explanation of the rule
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IP addresses in IP packet filter rules
The IP address consists of four decimal numbers with the range from 0 to 255, each number
separated by a period; example: 141.80.0.16
In the packet filter rule, you have the following options for specifying IP addresses:
● Nothing specified
There is no check, the rule applies to all IP addresses.
● An IP address
The rule applies specifically to the specified address.
● Address range
The rule applies to all the IP addresses covered by the address range.
An address range is defined by specifying the number of valid bit places in the IP address
in the format:
[IP address]/[number of bits to be included]
– [IP address]/24 therefore means that only the most significant 24 bits of the IP address
are included in the filter rule: These are the first three octets or numbers numbers in
the IP address.
– [IP address ]/25 means that only the first three octets and the highest bit of the fourth
octet of the IP address are included in the filter rule.
Table 5- 3
Examples of address ranges in IP addresses
Source IP or destination
IP
Address range
Number of
addresses*)
from
to
192.168.0.0/16
192.168.0.0
192.168.255.255
65.536
192.168.10.0/24
192.168.10.0
192.168.10.255
256
192.168.10.0/25
192.168.10.0
192.168.10.127
128
192.168.10.0/26
192.168.10.0
192.168.10.63
64
192.168.10.0/27
192.168.10.0
192.168.10.31
32
192.168.10.0/28
192.168.10.0
192.168.10.15
16
192.168.10.0/29
192.168.10.0
192.168.10.7
8
192.168.10.0/30
192.168.10.0
192.168.10.3
4
*) Note: Note that the address values 0 and 255 in the IP address have special functions (0 stands for
a network address, 255 for a broadcast address). The number of actually available addresses is
therefore reduced.
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Order for rule evaluation by SCALANCE S
The packet filter rules are evaluated by a SCALANCE S as follows:
● The list is evaluated from top to bottom; if rules are contradictory, the rule higher in the list
is therefore applied.
● In rules for communication between the internal and external network, the final rule is: All
packets except for the packets explicitly allowed in the list are blocked.
● In rules for communication between the internal network and IPsec tunnel, the final rule
is: All packets except for the packets explicitly blocked in the list are allowed.
Example
The packet filter rules shown as examples in the dialog above have the following effects:
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5.4.5
All packet types from internal to external are blocked as default, except for those explicitly allowed.
All packet types from external to internal are blocked as default, except for those explicitly allowed.
IP packet filter rule 1 allows packets with the service definition "Service X1" from internal to external.
IP packet filter rule 2 allows packets from external to internal when the following conditions are met:

IP address of the sender: 196.65.254.2

IP address of the recipient: 197.54.199.4

Service definition: "Service X2"
IP packet filter rule 3 blocks packets with the service definition "Service X2" in the VPN (IPsec tunnel).
IPsec tunnel communication is allowed as default except for the explicitly blocked packet types.
Defining IP services
Using the IP service definitions, you can define succinct and clear firewall rules for specific
services. You select a name and assign the service parameters to it.
These services defined in this way can also be grouped together under a group name.
When you configure the global or local packet filter rule, you simply use this name.
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Dialog / tab
Open the dialog as follows:
● Using the menu command Options ▶ IP/MAC Service Definition...
or
● From the "Firewall/IP Rules" tab with the "IP Service Definitions..." button.
Parameters for IP services
You define the IP services using the following parameters:
Table 5- 4
IP services: Parameter
Name
Meaning/comment
Available options / ranges of values
Name
User-definable name for the service that is used as
identification in the rule definition or in the group.
Can be selected by user
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Name
Meaning/comment
Available options / ranges of values
Protocol
Name of the protocol type
TCP
UDP
Any (TCP and UDP)
Source port
The filtering is based on the specified port number; this defines
the service access at the packet sender.
Examples:
*: Port is not checked
20 or 21: FTP service
Destination port
The filtering is based on the specified port number; this defines
the service access at the packet recipient.
Examples:
*: Port is not checked
80: Web HTTP service
102: S7 protocol - TCP/port
5.4.6
defining ICMP services
Using the ICMP service definitions, you can define succinct and clear firewall rules for
specific services. You select a name and assign the service parameters to it.
These services defined in this way can also be grouped together under a group name.
When you configure the packet filter rules, you simply use this name.
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Dialog / tab
Open the dialog as follows:
● With the menu command
Options ▶ IP Service Definition...
or
● From the "Firewall" tab with the "IP Service Definitions.." button .
Parameters for ICMP services
You define the ICMP services using the following parameters:
Table 5- 5
ICMP services: Parameter
Name
Meaning/comment
Available options / ranges of values
Name
User-definable name for the service that is used as
identification in the rule definition or in the group.
Can be selected by user
Type
Type of ICMP message

Code
Codes of the ICMP type
Values depend on the selected type.
Refer to the dialog illustration
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5.4.7
Setting MAC packet filter rules
With MAC packet filter rules, you can filter MAC packets.
Note
Routing mode
If you have enabled the routing mode for the SCALANCE S module, MAC rules are
irrelevant (dialogs are disabled).
Dialog / tab
Select the module you want to edit and then select the following menu command to set up
the firewall:
Edit ▶ Properties..., "Firewall", "MAC Rules" tab
Figure 5-2
"MAC Rules" dialog, based on an example of SCALANCE S602
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Entering packet filter rules
Enter the firewall rules in the list one after the other; note the following parameter description
and the examples in the following sections or in the online help.
Using global rule sets
Global rule sets you have assigned to the module are automatically entered in the local rule
set. These are initially at the end of the rule list and are therefore processed with lowest
priority. You can change the priority by changing the position of a local or global rule set in
the rule list.
The online help explains the meaning of the individual buttons.
5.4.8
F1
MAC packet filter rules
MAC packet filter rules are processed based on the following evaluations:
● Parameters entered in the rule;
● Priority of the rule within the rule set.
MAC packet filter rules
The configuration of a MAC rule includes the following parameters:
Table 5- 6
MAC rules: Parameter
Name
Meaning/comment
Available options / ranges of
values
Action
Allow/disallow (enable/block)

Allow
Allow packets according to
definition.

Drop
Block packets according to
definition.
Direction
Specifies the direction and type of data traffic

Internal → external
("Tunnel / Any" only for S612/S613)

Internal ← external

Tunnel → internal

Tunnel ← internal

Internal → any

Internal ← any
Source MAC
Source MAC address
Destination MAC
Destination MAC address
As an alternative to specifying
a MAC address, you can enter
a symbolic name.
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Name
Meaning/comment
Available options / ranges of
values
Service
Name of the MAC service or service group used.
The drop-down list box displays
the configured services and
service groups you can select.
No entry means: No service is
checked, the rule applies to all
services.
Range of values:
A packet passes through the firewall if the pass rule matches and 0.001 to 100 Mbps
the permitted bandwidth for this rule has not yet been exceeded.
Bandwidth (Mbps)
Option for setting a bandwidth limitation.
Logging
Enable or disable logging for this rule
Comment
Space for your own explanation of the rule
How SCALANCE S evaluates the rules
The packet filter rules are evaluated by a SCALANCE S as follows:
● The list is evaluated from top to bottom; if rules are contradictory, the rule higher in the list
is therefore applied.
● The following applies to all packets not explicitly listed for the rules for communication in
the direction internal -> external and internal <- external: All packets except for the
packets explicitly allowed in the list are blocked.
● The following applies to all packets not explicitly listed for the rules for communication in
the direction internal -> IPsec tunnel and internal <- IPsec tunnel: All packets except for
the packets explicitly blocked in the list are allowed.
NOTICE
In bridge mode: IP rules apply to IP packets, MAC rules apply to layer 2 packets
If a module is in bridge mode, both IP and MAC rules can be defined for the firewall.
Rules for editing in the firewall are based on the Ethertype.
IP packets are forwarded or blocked depending on the IP rules and layer 2 packets are
forwarded or blocked depending on the MAC rules.
It is not possible to filter an IP packet using a MAC firewall rule, for example based on a
MAC address.
Examples
You can apply the example of an IP packet filter in Section 5.4.3 analogously to the MAC
packet filter rules.
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5.4.9
defining MAC services
Using the MAC service definitions, you can define succinct and clear firewall rules for
specific services. You select a name and assign the service parameters to it.
These services defined in this way can also be grouped together under a group name.
When you configure the global or local packet filter rule, you simply use this name.
Dialog
Open the dialog as follows:
● With the following menu command:
Options ▶ MAC Service Definition...
or
● From the "Firewall/MAC Rules" tab with the "MAC Service Definitions..." button .
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Parameters for MAC services
A MAC service definition includes a category of protocol-specific MAC parameters:
Table 5- 7
MAC services - parameters
Name
Meaning/comment
Available options / ranges of values
Name
User-definable name for the service that is used as
identification in the rule definition or in the group.
Can be selected by user
Protocol
Name of the protocol type:


ISO
ISO

SNAP
ISO identifies packets with the following properties:

0x (code entry)
Lengthfield <= 05DC (hex),
DSAP= userdefined
SSAP= userdefined
CTRL= userdefined

SNAP
SNAP identifies packets with the following properties:
Lengthfield <= 05DC (hex),
DSAP=AA (hex),
SSAP=AA (hex),
CTRL=03 (hex),
OUI=userdefined,
OUI-Type=userdefined
DSAP
Destination Service Access Point: LLC recipient address
SSAP
Source Service Access Point: LLC sender address
CTRL
LLC control field
OUI
Organizationally Unique Identifier (the first three bytes of
the MAC address = vendor identification)
OUI-Type
Protocol type/identification
*) The protocol entries 0800 (hex) and 0806 (hex) are not accepted since these values apply to IP or ICMP packets. These
packets are filtered using IP rules.
Special settings for SIMATIC NET services
To filter special SIMATIC NET services, please use the following SNAP settings:
● DCP (Primary Setup Tool):
PROFINET
● SiClock :
OUI= 08 00 06 (hex) , OUI-Type= 01 00 (hex)
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5.4.10
Setting up service groups
Forming service groups
You can put several services together by creating service groups. In this way, you can set up
more complex services that can be used in the packet filter rules simply by selecting the
name.
Dialogs / tabs
Open the dialog as follows:
● With the following menu command:
Options ▶ IP/MAC Service Definition...
or
● From the "Firewall/IP Rules" tab or "Firewall/MAC Rules" with the "IP/MAC Service
Definitions.." button. .
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5.5 Time synchronization
5.5
Time synchronization
Meaning
The date and time are kept on the SCALANCE S module to check the validity (time) of a
certificate and for the time stamps of log entries.
Note
Time-of-day synchronization relates solely to the SCALANCE S module and cannot be used
to synchronize devices in the internal network of the SCALANCE S.
Alternative methods of timekeeping
The following alternatives can be configured:
● Local PC clock
The module time is set automatically to the PC time when a configuration is downloaded.
● NTP server
Automatic setting and periodic synchronization of the time using an NTP server (Network
Time Protocol).
Opening the dialog for configuring time synchronization
Select the module you want to edit and then the following menu command:
Edit ▶ Properties..., "Time Synchronization" tab
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5.5 Time synchronization
Synchronization by an NTP time server
If you want the time to be synchronized by an NTP time server, specify the two following
parameters in the configuration:
● IP address of the NTP server
● The update interval in seconds
NOTICE
If the NTP server cannot be reached by the SCALANCE S over an IPsec tunnel
connection, you must allow the packets from the NTP server explicitly in the firewall
(UDP, Port 123).
External time frames
External time frames are not secure and can be corrupted/counterfeited in the external
network. This can, for example, lead to falsification of the local time in the internal network
and on SCALANCE S modules.
For this reason, NTP servers should be located in internal networks.
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5.6 Creating SSL certificates
5.6
Creating SSL certificates
Meaning
SSL certificates are sued for authentication of the communication between a device and
SCALANCE S in online communication.
Opening the dialog for managing SSL certificates
Select the module you want to edit and then the following menu command:
Edit ▶ Properties ..., "SSL Certificate" tab
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5.7 Routing mode
5.7
Routing mode
5.7.1
Routing
Meaning
If you have enabled routing mode, packets intended for an existing IP address in the subnets
(internal or external) are forwarded. The firewall rules for the direction of transmission also
apply.
For this mode, you configure an internal IP address and an internal subnet mask for
addressing the router in the internal subnet in the dialog shown below.
Operating view
Configuration of this function is identical in standard and advanced mode.
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5.7 Routing mode
Enabling router operation
1. Select the module you want to edit and then the following menu command:
Edit ▶ Properties ..., "Routing -Mode" tab
2. Select the "active" routing option.
3. This activates input boxes in which you enter an internal IP address and an internal
subnet mask for addressing the router on the internal subnet.
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5.7 Routing mode
5.7.2
NAT/NAPT routing
Meaning
By configuring address conversion in the "Routing Mode" dialog, you operate the
SCALANCE S as NAT/NAPT router. With this technique, the addresses of the nodes in the
internal subnet are not known in the external network; the internal nodes are visible in the
external network only under the external IP addresses defined in the address conversion list
(NAT table and NAPT table) and are therefore protected from direct access.
● NAT: Network Address Translation
● NAPT: Network Address Port Translation
Operating view
This function is available in advanced mode.
To use all the functions and menu commands described in section, switch over the mode:
View ▶ Advanced Mode
The mode described here includes operation as default router. You should therefore refer to
the information in the section "Routing".
Relationship between NAT/NAPT router and firewall
Whatever the direction, packets first run through the address conversion in the NAT/NAPT
router and then pass through the firewall. The settings for the NAT/NAPT router and the
firewall rules must be matched so that packets with a converted address can pass through
the firewall.
The firewall and NAT/NAPT router supports the "Stateful Packet Inspection" mechanism. As
a result, reply packets can pass through the NAT/NAPT router and firewall without it being
necessary for their addresses to be included in the firewall rule and the NAT/NAPT address
conversion.
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SCALANCE S
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Note the examples in the sections below.
Restrictions
The list described here contains a static, specified address conversion for the nodes on the
internal network (subnet).
Editing the dialog for enabling NAT/NAPT router mode
1. Select the module you want to edit and then the following menu command:
Edit ▶ Properties ..., "Routing -Mode" tab
2. When required, enable address conversion according to NAT(Network Adress
Translation) or NAPT (Network Address Port Translation).
3. Configure the address conversion as shown below.
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5.7 Routing mode
"NAT" (Network Address Translation) group box
The following applies here: Address = IP address
Table 5- 8
NAT options
Check box
Meaning
NAT active
The input boxes for NAT are enabled.
NAT address conversions only take effect with the option described below
and with entries in the address conversion list.
You must also configure the firewall accordingly (see examples).
Allow Internal >
External for all users
By selecting this option, the internal IP address is converted to the external
module IP address for all packets sent from internal to external and an
additional port number is assigned by the module.
This behavior is indicated by an extra row being displayed at the bottom of
the NAT table. The symbol "*" in the "internal IP address" column indicates
that all packets sent from internal to external will be converted.
Note: Due to this effect on the address conversion list, this option is
assigned to the NAT group box despite the additional assignment of a port
number.
Table 5- 9
NAT table
Parameter
Meaning/comment
External IP address

For packet direction "Internal → External":
newly assigned IP address

For packet direction "External → Internal":
detected IP address

For packet direction "External → Internal":
newly assigned IP address

For packet direction "Internal → External":
detected IP address
Internal IP address
Direction
Available options / ranges
of values
Refer to the section "IP
addresses in IP packet
filter rules" in this chapter.
As an alternative, you can
enter symbolic names.
Assign the packet direction here.

Internal → external
Effect based on example "Internal → External":
Packets coming from the internal subnet are
checked for the specified internal IP address
and forwarded to the external network with the
specified external IP address.

External → Internal

Bidirectional
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5.7 Routing mode
"NAPT" (Network Address Port Translation) group box
The following applies here: Address = IP address + port number
Table 5- 10
NAPT options
Check box
Meaning
NAPT active
The input boxes for NAPT are enabled.
NAPT address conversions take effect only after entries have been made in
the address conversion list.
You must also configure the firewall accordingly (see examples).
External IP address
Table 5- 11
Displays the IP address of the SCALANCE S module used by the nodes on
the external network as the router address.
NAPT table
Parameter
Meaning/comment
Available options / ranges
of values
external port
A node in the external network can reply to a
node in the internal subnet or send a packet to
it by using this port number.
Port or port range
Example of entering a port
range:

Internal IP address
IP address of the node addressed on the
internal subnet
78:99
Refer to the section "IP
addresses in IP packet
filter rules" in this chapter.
As an alternative, you can
enter symbolic names.
internal port
Port number of a service on the node
addressed in the internal subnet.
Port (no port range)
Consistency check - these rules must be adhered to
When assigning addresses, remember the following rules to obtain consistent entries:
Check / rule
Check made
locally
The network ID of the internal subnet must be different from the network ID of the
external subnet.
project-wide
x
The internal IP addresses must not be identical to the IP addresses of the module.
x
Use the part specified by the subnet mask for the network ID.
x

For the external IP address, use the part of the address of the external
SCALANCE S IP address specified by the external subnet mask.

For the internal IP address, use the part of the address of the internal
SCALANCE S IP address specified by the internal subnet mask.
An IP address used in the NAT/NAPT address conversion list must not be a
multicast or broadcast address.
x
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Check / rule
Check made
locally
project-wide
The default router must be in one of the two subnets of the SCALANCE S; in other
words, it must match either the external or internal IP address.
x
The external ports assigned for the NAPT conversion are in the range > 0 and
<= 65535.
x
Port123 (NTP), 443 (HTTPS), 514 (Syslog) and 500+4500 (IPsec; only for S612
and S613) are also excluded.
The external IP address of the SCALANCE S may only be used in the NAT table
for the direction "Internal → External".
x
The internal IP address of the SCALANCE S may only be used in the NAT table
and not in the NAPT table.
x
Checking for duplicates in the NAT table
x
An external IP address used in the direction "External → Internal" or "Bidirectional"
may only occur once in the NAT table.
Checking for duplicates in the NAPT table
x

An external port number may only be entered once. Since the IP address of
the SCALANCE S is always used as the external IP address, multiple use
would lead to ambiguities.

The port numbers or port ranges of the external ports must not overlap.
As soon as the routing mode is enabled, the second addresses (IP/subnet) must
be assigned to the SCALANCE S.
x
Internal NAPT ports can be between > 0 and <= 65535.
x
Once you have completed your entries, run a consistency check.
Select the following menu command:
Options ▶ Check Consistency
5.7.3
NAT/NAPT routing - Examples of configuration part 1
Overview
The section contains the following examples of configuring the NAT/NAPT router:
● Example 1: NAT address conversion "External → Internal"
● Example 2: NAT address conversion "Internal → External"
● Example 3: NAT address conversion "Bidirectional"
● Example 4: NAPT address conversion
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Project engineering
In the following routing configurations, you will find address assignments according to the
NAT and NAP address conversion:
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Description
● Example 1: NAT address conversion "External → Internal"
A node in the external network can send a packet to the node with the internal IP address
192.168.12.3 in the internal subnet by using the external IP address 192.168.10.123 as
destination address.
● Example 2: NAT address conversion "Internal → External"
Packets of an internal node with the internal IP address 192.168.12.3 are forwarded to
the external network with the external IP address 192.168.10.124 as the source address.
In the example, the firewall is set so that packets with the source IP address
192.168.10.124 are allowed from internal to external and that nodes with the IP address
192.168.10.11 can be reached.
● Example 3: NAT address conversion "Bidirectional"
In this example, the address conversion is made both for internal and external incoming
packets as follows:
– A node in the external network can send a packet to the node with the internal IP
address 192.168.12.4 in the internal subnet by using the external IP address
192.168.10.101 as destination address.
– Packets of an internal node with the internal IP address 192.168.12.4 are forwarded
on the external network with the external IP address 192.168.10.101 as the source
address. The firewall is set so that frames with the source IP address 192.168.10.101
are allowed from internal to external.
● Example 4: NAPT address conversion
Addresses are converted according to NAPT so that additional port numbers are also
assigned. The destination IP address and destination port number of all TCP and UDP
packets entering the external network are checked.
– A node in the external network can send a packet to the node with IP address
192.168.12.4 and port number 345 in the internal subnet by using the external module
IP address 192.160.10.1 and the external or number 8000 as the destination address.
5.7.4
NAT/NAPT routing - Examples of configuration part 2
Overview
The section contains the following examples of configuring the NAT/NAPT router:
● Example 1: Allow external communication for all internal nodes
● Example 2: Also allow frames from external to internal.
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Project engineering
In the following routing configurations, you will find address assignments according to the
NAT address conversion:
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5.8 DHCP server
Description
Example 1 - Allow external communication for all internal nodes
The "Allow Internal -> External for all users" check box is selected in the "NAT" group box.
This makes communication from internal to external possible. The address conversion works
so that all internal addresses are converted to the external IP address of SCALANCE S and
a dynamically assigned port number.
Specifying a direction in the NAT address conversion list is now no longer relevant. All the
other information relates to the communication direction external to internal.
The firewall is set so that the frames can pass from internal to external.
Example 2 - Also allow frames from external to internal.
To also allow communication from external to internal over and above the communication in
example 1, entries must be made in the NAT or NAPT address conversion list. The entry in
the example, means that frames to the node with IP address 192.168.10.102 will be
converted to the internal IP address 192.168.12.3.
The firewall must be set accordingly. Since the NAT/NAPT conversion is always made first
and the converted address is then tested in a second step in the firewall, the internal IP
address is entered as the destination IP address in the firewall in our example.
5.8
DHCP server
Overview
You can operate SCALANCE S on the internal network as a DHCP server. This allows IP
addresses to be assigned automatically to the devices connected to the internal network.
The IP addresses are assigned either dynamically from an address band you have specified
or you can select a specific IP address for a particular device.
Switch over to advanced mode
Configuration as a DHCP server is possible only in "Advanced mode" in the Security
Configuration Tool. Change the mode using the following menu command:
View ▶ Advanced Mode
Prerequisite
You configure the devices in the internal network so that they obtain the IP address from a
DHCP server.
Depending on the mode, SCALANCE S informs the nodes in the subnet of a router IP
address otherwise you must make the router IP address known to the nodes in the subnet.
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5.8 DHCP server
● Router IP address will be transferred
In the following situations, the DHCP protocol of SCALANCE S will inform the nodes of
the router IP address:
– SCALANCE S is configured for router mode;
In this case, SCALANCE S sends its own IP address as the router IP address
– SCALANCE S is not configured for router mode but a default router is specified in the
configuration of the SCALANCE S;
In this case, SCALANCE S sends the default router IP address as the router IP
address.
● Router IP address will not be transferred
In the following situations, enter the router IP address manually on the nodes:
– SCALANCE S is not configured for router mode;
– No default router is specified in the configuration of SCALANCE S.
Variants
You have the following configuration options:
● Static address assignment
Devices with a specific MAC address or client ID are assigned the specified IP
addresses. You specify these addresses by entering the devices in the address list in the
"Static IP addresses" group box.
● Dynamic address assignment
Devices whose MAC address or whose client ID was not specified specifically, are
assigned a random IP address from a specified address range. You set this address
range in the "Dynamic IP addresses" group box.
NOTICE
Dynamic address assignment - reaction after interrupting the power supply
Please note that dynamically assigned IP addresses are not saved if the power supply is
interrupted. On return of the power, you must therefore make sure that the nodes
request an IP address again.
You should therefore only use dynamic address assignment for the following nodes:
 Nodes that are used temporarily in the subnet (such as service devices);
 Nodes that have been assigned an IP address and send this as the "preferred
address" the next time they request an address from the DHCP server (for example
PC stations).
For nodes in permanent operation, use of a static address assignment by specifying a
client ID (recommended for S7-CPs because it is simpler to replace modules) or the
MAC address
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5.8 DHCP server
Symbolic names are supported
You can also enter the IP addresses or MAC addresses as symbolic names in the function
described here.
Consistency check - these rules must be adhered to
Remember the following rules when making the entries.
Check / rule
Check made1)
locally
Project-/modulewide
The IP addresses assigned in the address list in the "Static IP addresses" group
box must not be in the range of the dynamic IP addresses.
x
Symbolic names must have a numeric address assignment. If you assign symbolic
names for the first time here, you must still make the address assignment in the
"Symbolic names" dialog.
x
IP addresses, MAC addresses and client IDs may only occur once in the "Static IP
addresses" table (related to the SCALANCE S module).
x
For the statically assigned IP addresses, you must specify either the MAC address
or the client ID (computer name).
x
The client ID is a string with a maximum of 63 characters. Only the following
characters may be used: a-z, A-Z, 0-9 and - (dash).
x
Note:
In SIMATIC S7, a client ID can be assigned to the devices on the Ethernet
interface to obtain an IP address over DHCP.
With PCs, the method depends on the operating system being used; we
recommend that you use the MAC address for the assignment here.
For the statically assigned IP addresses, you must specify the IP address.
The following IP addresses must not be in the range of the free IP address band
(dynamic IP addresses):

All router addresses in the "Network" tab

NTP server

Syslog server

Default router

SCALANCE S address(es)
DHCP is supported by SCALANCE S on the interface to the internal subnet. The
following additional requirements for IP addresses in the range of the free IP
address band (dynamic IP addresses) result from operational behavior of the
SCALANCE S:

x
x
x
Operation in flat networks
The range of the free IP address band must be in the network defined by
SCALANCE S.

Router mode
The range of the free IP address band must be in the internal subnet defined
by SCALANCE S.
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5.8 DHCP server
Check / rule
Check made1)
locally
The free IP address band must be fully specified by entering the start IP address
and the end IP address. The end IP address must be higher than the start IP
address.
The IP addresses you enter in the address list in the "Static IP addresses" group
box must be in the address range of the internal subnet of the SCALANCE S
module.
Project-/modulewide
x
x
Legend:
1)
Note the explanations in the section "Consistency checks".
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Secure communication in the VPN over an IPSec
tunnel (S612/S613)
6
This chapter describes how to connect the IP subnets protected by a SCALANCE S to a
virtual private network using drag-and-drop.
As already described in Chapter 5 in the module properties, you can once again use the
default settings to achieve secure communication within your internal networks.
Further information
You will find detailed information on the dialogs and parameter settings in the online help.
You can call this with the F1 key or using the "Help" button in the relevant dialog.
F1
See also
Online functions - test, diagnostics, and logging (Page 219)
6.1
VPN with SCALANCE S
Secure connection through an unprotected network
For the internal networks protected by a SCALANCE S, IPsec tunnels allow a secure data
connection through the non-secure external network.
Data exchange between devices through the IPsec tunnel in the VPN has the following
properties:
● Confidentiality
The data exchanged is safe from eavesdropping;
● Integrity
The data exchanged is safe from corruption/counterfeiting;
● Authenticity
Only those with the appropriate rights can set up a tunnel.
SCALANCE S uses the IPsec protocol for tunneling (tunnel mode of IPsec).
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6.1 VPN with SCALANCE S
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Tunnel connections exist between modules in the same group (VPN)
The properties of a VPN are put together in a module group on the SCALANCE S for all
IPsec tunnels.
IPsec tunnels are established automatically between all SCALANCE S modules and
SOFTNET Security Client modules that belong to the same group.
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6.1 VPN with SCALANCE S
SCALANCE S modules can belong to several different groups at the same time in one
project.
NOTICE
If the name of a SCALANCE S module is changed, all the SCALANCE S modules of the
groups to which the changed SCALANCE S module belongs must be reconfigured (menu
commandTransfer▶ To All Modules...).
If the name of a group is changed, all SCALANCE S modules of this group must be
reconfigured in (menu commandTransfer ▶ To All Modules...).
NOTICE
Layer 2 frames are tunneled only when there is no router between two SCALANCE S
modules.
The following applies in general: Non-IP packets are transferred through a tunnel only when
the devices that send or receive the packets were able to communicate previously; in other
words, without using the SCALANCE S.
Whether or not the network nodes were able to communicate prior to the use of the
SCALANCE S is decided based on the IP networks in which the SCALANCE S devices are
located. If the SCALANCE S modules are located in the same IP subnet, it is assumed that
the end devices in the networks secured by the SCALANCE S were able to communicate
with non-IP packets prior to the use of the SCALANCE S. The non-IP packets are then
tunneled.
Authentication method
The authentication method is specified within a group (within a VPN) and decides the type of
authentication used.
Key-based or certificate-based authentication methods are supported:
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6.2 Groups
● Preshared keys
The preshared key is distributed to all modules in the group.
First enter a password in the "Preshared Key" box in the "Group Properties" dialog.
● Certificate
Certificate-based authentication is the default that is also active in standard mode. The
procedure is as follows:
– When a group is generated, a group certificate is generated (group certificate = CA
certificate).
– Each SCALANCE S in the group receives a certificate signed with the key of the group
CA.
All certificates are based on the ITU standard X.509v3 (ITU, International
Telecommunications Union).
The certificates are generated by a certification function in the Security Configuration
Tool.
NOTICE
Restriction in VLAN operation
NO VLAN tagging is transferred within a VPN tunnel set up with SCALANCE S.
Reason: The VLAN tags are lost in unicast packets when they pass through the
SCALANCE S because IPsec is used to transfer the IP packets. Only IP packets (not
Ethernet packets) are transferred through an IPsec tunnel and the VLAN tags are
therefore lost.
As default, broadcast or multicast packets cannot be transferred with IPsec. With
SCALANCE S, IP broadcast packets are "packaged" and transferred just like MAC
packets in UDP including the Ethernet header. With these packets, the VLAN tagging is
therefore retained.
6.2
Groups
6.2.1
Creating groups and assigning modules
Follow the steps below to configure a VPN
With the menu command
Insert ▶ Group
create a new group.
Assign the SCALANCE S modules and SOFTNET Security Client modules intended for an
internal network to the group. by dragging the module to the required group with the mouse.
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6.2 Groups
Configuring properties
Just as when configuring modules, the two selectable operating views in the Security
Configuration Tool have an effect on configuring groups:
(View ▶ Advanced Mode menu command)
● Standard mode
In standard mode, you retain the defaults set by the system. Even if you are not an IT
expert, you can nevertheless configure IPsec tunnels and operate secure data
communication in your internal networks.
● Advanced mode
The advanced mode provides you with options for setting specific configurations for
tunnel communication.
Note
Setting parameters for MD 740 / MD 741 or other VPN clients
To set the parameter for MD 740 / MD 741 or other VPN clients, you configure VPN
properties for the specific modules in advanced mode.
Displaying all configured groups and their properties
Select "All Groups" in the Navigation Area
The following properties of the groups are displayed in columns:
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6.2 Groups
Table 6- 1
Group properties
Property/column
Meaning
Comment/selection
Group Name
Group Name
Freely selectable
Authentication
Type of authentication
• Preshared Key
• Certificate
Group membership until...
Life of certificates
See below
Comment
Comment
Freely selectable
Setting the life of certificates
Open the dialog in which you can set the expiry date of the certificate as follows:
● By double-clicking on a module in the properties window or right-clicking and selecting
the Properties menu command.
NOTICE
When the certificate expires, communication through the tunnel is completed.
6.2.2
Module types within a group
Module types
You can configure the following module types in groups with the Security Configuration Tool:
● SCALANCE S612
● SCALANCE S613
● SOFTNET Security Client
● MD 74x (stands for MD740-1 or MD741-1)
Rules for forming groups
Remember the following rules if you want to create VPN groups:
● The first assigned module in a VPN group decides which other modules can be added to
it.
If the first device added is in routing mode, you can only add other modules that have
routing enabled on them. If the first device is in bridge mode, you can only add other
modules that are in bridge mode. If you want to change the "mode" of a VPN group, you
will have to remove all the modules contained in the group and add them again.
● It is not possible to add an MD 740-1/MD 741-1 module to a VPN group that contains a
module in bridge mode.
Refer to the following table to see which modules can grouped together in a VPN group.
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6.3 Tunnel configuration in standard mode
Module
Module mode…
.... in bridge mode
… in routing mode
x
-
*)
x
x
S613 V1
x
-
S613 V2 *)
x
x
SOFTNET Security Client 2005
x
-
SOFTNET Security Client 2008
x
x
SOFTNET Security Client V3.0
x
x
MD 74x
-
x
S612 V1
S612 V2
6.3
Tunnel configuration in standard mode
Group properties
The following properties apply in standard mode:
● All parameters of the IPsec tunnel and the authentication are preset.
You can display the set default values in the properties dialog for the group.
● The learning mode is active for all modules.
Opening the dialog for displaying default values
With a group selected, select the following menu command:
Edit ▶ Properties...
The display is identical to the dialog in advanced mode; the values cannot, however, be
modified.
6.4
Tunnel configuration in advanced mode
The advanced mode provides you with options for setting specific configurations for tunnel
communication.
Switch over to advanced mode
To use all the functions and menu commands described in section, switch over the mode:
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6.4 Tunnel configuration in advanced mode
View ▶ Advanced Mode
Note
If you switch to the advanced mode for the current project, you can no longer switch back.
Unless you exit the project without saving and the open it again.
6.4.1
Configuring group properties
Group properties
The following group properties can be set in the "advanced mode" operating view:
● Authentication method
● IKE settings (dialog area: Advanced Settings Phase 1)
● IPsec settings (dialog area: Advanced Settings Phase 2)
NOTICE
To be able to set these parameters, you require IPsec experience.
If you do not make or modify any settings, the defaults of standard mode apply.
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6.4 Tunnel configuration in advanced mode
Opening the dialog for entering group properties
● With a group selected, select the following menu command:
Edit ▶ Properties...
Parameters for advanced settings phase 1 - IKE settings
Phase 1: IKE (Internet Key Exchange):
Here, you can set parameters for the protocol of the IPsec key management. The key
exchange uses the standardized IKE method.
You can set the following IKE protocol parameters:
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Table 6- 2
IKE protocol parameters (parameter group "Advanced Settings Phase 1" in the dialog)
Parameter
Values/selection
IKE Mode

Main mode
Key exchange method

Aggressive mode
The difference between the main and aggressive mode is
the "identity protection" used in the main mode. The identity
is transferred encrypted in main mode but not in aggressive
mode.
Phase 1 DH Group

Group 1
Diffie-Hellman key agreement:
Phase 1 DH Group

Group 2

Group 5
Diffie-Hellman groups (selectable cryptographic algorithms
in the Oakley key exchange protocol)

Time
SA Lifetype
SA Lifetype
Comment
Phase 1 Security Association (SA)

Time limitation (min., default: 2500000)
The lifetime of the current key material is limited in time.
When the time expires, the key material is renegotiated.
SA Life
Numeric value
SA Life
("Time"→Min., )
Range of values: 1440...2 500 000
Phase 1 Encryption

DES
Encryption algorithm
Phase 1 Encryption

3DES-168

Data Encryption Standard (56 bit key length, mode CBC)

AES-128

Triple DES (168 bit key length, mode CBC)

AES-192


AES-256
Advanced Encryption Standard (128 bit, 192 bit or 256
bit key length, mode CBC)
Phase 1 Authentication

MD5
Authentication algorithm
Phase 1 Authentication

SHA1

Message Digest Version 5

Secure Hash Algorithm 1
Parameters for advanced settings phase 2 - IPsec settings
Phase 2: Data exchange (ESP, Encapsulating Security Payload)
Here, you can set parameters for the protocol of the IPsec data exchange. The data
exchange uses the standardized security protocol ESP.
You can set the following ESP protocol parameters:
Table 6- 3
IPsec protocol parameters (parameter group "Advanced Settings Phase 2" in the dialog)
Parameter
Values/selection
SA Lifetype

Time
SA Lifetype
Comment
Phase 2 Security Association (SA)

Time limitation (min., default: 2880)
The lifetime of the current key material is limited in time.
When the time expires, the key material is renegotiated.

Limit

Data amounts limited
(Mbytes, default 4000)
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6.4 Tunnel configuration in advanced mode
Parameter
Values/selection
Comment
SA Life
Numeric value
("Time"→Min., "Limit" → Mbyte)
SA Life
Range of values (time): 1440...16 666 666
Range of values (limit): 2000...500 000
Phase 2 Encryption

3DES-168
Encryption algorithm
Phase 2 Encryption

DES

Special triple DES (168 bit key length, mode CBC)

AES-128

Data Encryption Standard (56 bit key length, mode CBC)

Advanced Encrypting Standard (128 bit key length,
mode CBC)
Phase 2 Authentication

MD5
Authentication algorithm
Phase 2 Authentication

SHA1

Message Digest Version 5

Secure Hash Algorithm 1
Perfect Forward Secrecy
6.4.2

On

Off
Each time an IPsec-SA is renegotiated, the key is
negotiated again using the Diffie-Hellman method.
Including a SCALANCE S in a configured group
The configured group properties are adopted for a SCALANCE S to be included in an
existing group.
Follow the steps below:
Depending on whether you have changed any group properties or not, you must make a
distinction between the following:
● Case a: When you have not changed group properties
1. Add the new SCALANCE S to the group.
2. Download the configuration to the new modules.
● Case b: When you have changed group properties
1. Add the new SCALANCE S to the group.
2. Download the configuration to all modules that belong to the group.
Advantage
Existing SCALANCE S modules that have already been commissioned do not need to be
reconfigured and downloaded. There is no effect on or interruption of active communication.
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6.4 Tunnel configuration in advanced mode
6.4.3
SOFTNET Security Client
Compatible settings for SOFTNET Security Client
Please note the following special features if you include modules of the type SOFTNET
Security Client in the configured group:
Parameter
Setting / special feature
Phase 1 DH Group
Phase 1 DH Group
DH group1 and 5 can only be used for
communication between the SCALANCE S
modules.
Phase 1 Encryption
No DES, AES-128 and AES-192 possible.
Phase 1 Encryption
Phase 1 Authentication
No MD5 possible.
Phase 1 Authentication
Phase 1 SA Life
Phase 1 SA Lifetime
Range of values: 1440 to 2879 (only SOFTNET
Security Client V3.0)
SA Lifetype
Must be selected identical for both phases.
SA Lifetype
Phase 2 Encryption
No AES 128 possible.
Phase 2 Encryption
Phase 2 SA Life
Phase 2 SA Lifetime
Range of values: 1440 to 2879 (only SOFTNET
Security Client V3.0)
Phase 2 Authentication
No MD5 possible.
Phase 2 Authentication
NOTICE
The settings of the parameters for a SOFTNET Security Client configuration must match
the default proposals of the SCALANCE S modules since a SOFTNET Security Client is
usually mobile and obtains its IP address dynamically, the SCALANCE S can only allow a
connection using these default proposals.
Please make sure that your Phase 1 settings match one of the three following proposals to
be able to establish a tunnel with a SCALANCE S.
If you use other settings in the Security Configuration Tool, when you try to export the
configuration, the consistency check cuts in and you cannot export your configuration for
the SOFTNET Security Client until you have adapted the settings accordingly.
Authentication
IKE Mode
DH group
Encryption
Hash
Lifetime (min)
Certificate
Mainmode
DH group 2
3DES-168
SHA1
1440…2879
Preshared key
Mainmode
DH group 2
3DES-168
SHA1
1440…2879
Certificate
Mainmode
DH group 2
AES256
SHA1
1440…2879
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6.4 Tunnel configuration in advanced mode
6.4.4
Configuring module-specific VPN properties
You can configure the following module-specific properties for data exchange over the IPsec
tunnel in the VPN:
● Dead peer detection
● Permission to initiate connection establishment
● Public IP address for communication over Internet gateways
Opening the dialog for configuring VPN module properties
Select the module you want to edit and then the following menu command in advanced
mode:
Edit ▶ Properties..., "VPN" tab
Note
You can only select the "VPN" tab when the module you are configuring is in a VPN group.
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6.4 Tunnel configuration in advanced mode
Dead peer detection (DPD)
If DPD is enabled, the modules exchange additional messages at selectable intervals. This
makes it possible to detect whether there is still a connection in the VPN. If the connection
no longer exists, the "security associations" (SA) are terminated prematurely. If DPD is
disabled, the "security association" (SA) is terminated only after the SA life (for setting of SA
life: see configuration of the group properties) has elapsed.
As default, DPD is enabled.
Permission to initiate connection establishment
You can restrict the permission for initiating the VPN connection establishment to certain
modules in the VPN.
The decisive factor the setting of the parameter described here is the assignment of the IP
address for the gateway of the module you are configuring. If a static IP address is assigned,
the module can be found by the partner. If the IP address is assigned dynamically, and
therefore changes constantly, the partner cannot establish a connection as things stand.
Mode
Meaning
Start connection to remote VPN gateway
(standard)
If this option is selected, the module is "active", in other words, it
attempts to establish the connection to the partner.
This option is recommended when you obtain a dynamic IP address
from your provider for the gateway of the SCALANCE S module you
are configuring.
The partner is addressed over its configured WAN IP address or its
external module IP address.
Wait for connection from remote VPN gateway
If this option is selected, the module is "passive", in other words, it
waits for the partner to establish the connection.
This option is recommended when you obtain a static IP address from
your provider for the gateway of the module you are configuring. With
this setting, only the partner attempts to establish the connection.
NOTICE
Make sure that you do not set all the modules in a VPN group to "Wait for connection from
remote VPN gateway" otherwise a connection will never be established.
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6.4 Tunnel configuration in advanced mode
WAN IP address - IP addresses of the modules and gateways in a VPN over Internet
When operating a VPN with IPsec tunnel over the Internet, additional IP addresses are
generally required for the Internet gateways such as DSL routers. The individual SCALANCE
S modules or MD 740-1 / MD 741-1 modules must know the external IP addresses of the
partner modules in the VPN.
Note
If you use a DSL router as Internet gateway, the following ports (at least) must be opened on
it:
 Port 500 (ISAKMP)
 Port 4500 (NAT-T)
For configuration downloads (via the WAN without active tunnel), port 443 (HTTPS) must
also be open.
To allow this, when you configure the module, you have the option of assigning this external
IP address as a "WAN IP address". When you download the module configuration, the
modules are then informed of these WAN IP addresses of the partner modules.
If no WAN IP address is assigned, the external IP address of the module is used.
The following schematic illustrates the relationship between the IP addresses.
External
External
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External IP address - of a module
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External IP address (WAN IP address) - of an Internet gateway (for example DSL router)
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6.5 Configuring internal network nodes
6.5
Configuring internal network nodes
To make its own internal nodes known to the tunnel partners, a SCALANCE S must itself
know its own internal nodes. It must also know the internal nodes of the SCALANCE S
modules that are in the same group as itself. This information is used on a SCALANCE S to
decide which data packet will be transferred in which tunnel.
In flat networks, SCALANCE S allows network nodes to be learnt automatically or configured
statically.
In routing mode, complete subnets are tunneled; here learning and the static configuration of
network nodes is not necessary.
6.5.1
How the learning mode works
Finding nodes for tunnel communication automatically (bridge mode only)
One great advantage of configuration and operation of tunnel communication is that
SCALANCE S can find nodes in the internal network automatically.
New nodes are detected by SCALANCE S during operation. The detected nodes are
signaled to the SCALANCE S modules belonging to the same group. This allows data
exchange within the tunnels of a group in both directions at any time.
Requirements
The following nodes are detected:
● Network nodes with IP capability
Network nodes with IP capability are found when they send an ICMP response to the
ICMP subnet broadcast.
IP nodes downstream from routers can be found if the routers pass on ICMP broadcasts.
● ISO network nodes
Network nodes without IP capability but that can be addressed over ISO protocols can
also be learnt.
This is only possible if they reply to XID or TEST packets. TEST and XID (Exchange
Identification) are auxiliary protocols for exchanging information on layer 2. By sending
these packets with a broadcast address, these network nodes can be located.
● PROFINET nodes
Using DCP (Discovery and basic Configuration Protocol), it is possible to find PROFINET
nodes.
Network nodes that do not meet these conditions must be configured.
Subnets
Subnets located downstream from internal routers must also be configured.
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6.5 Configuring internal network nodes
Enabling/disabling the learning mode
The learning function is enabled in the configuration as default for every SCALANCE S
module by the Security Configuration Tool configuration software.
Learning can also be disabled completely. In this case, you must configure all internal nodes
participating in the tunnel communication manually.
You can open the dialog in which you select the option as follows:
● With a module selected, with the menu command
Edit ▶ Properties..., "Nodes" tab.
When is it useful to disable the automatic learning mode?
The default settings for SCALANCE S assume that internal networks are always "secure"; in
other words, in a normal situation no network node is connected to the internal network if it is
not trustworthy.
Disabling the learning mode can be useful if the internal network is static; in other words,
when the number of internal notes and their addresses do not change.
If the learning mode is disabled, this reduces the load on the medium and the nodes in the
internal network resulting from the learning packets. The performance of the SCALANCE S
is also slightly improved since it does not need to process the learning packets.
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6.5 Configuring internal network nodes
Note: In the learning mode, all nodes in the internal network are detected. The information
relating to numbers of stations etc. in the VPN relates only to nodes that communicate over
VPN in the internal network.
NOTICE
If more than 64 (with SCALANCE S613) or 32 (with SCALANCE S612) internal nodes are
being operated, the permitted configuration limits are exceeded and an illegal operating
state is generated. Due to the dynamics in the network traffic, this causes internal nodes
that have already been learned to be replaced by new previously unknown internal nodes.
6.5.2
Displaying the detected internal nodes
All detected nodes can be displayed in the Security Configuration Tool in the "Online" mode
in the "Internal Nodes" Tab.
Select the following menu command:
Edit ▶ Online Diagnostics...
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6.5 Configuring internal network nodes
6.5.3
Configuring nodes manually
Nodes that cannot be learnt
There are nodes in the internal network that cannot be learnt. You must then configure these
nodes. To do this, switch to advanced mode in the Security Configuration Tool.
You must also configure subnets located in the internal network of the SCALANCE S.
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6.5 Configuring internal network nodes
Dialog / tab
You can open the dialog in which you configure the nodes as follows:
● With a module selected, with the menu command
Edit ▶ Properties..., "Nodes" tab.
Here, in the various tabs, enter the required address parameters for all network nodes to be
protected by the selected SCALANCE S module.
"Internal IP Nodes" tab (bridge mode only)
Configurable parameters: IP address and optionally the MAC address
"Internal MAC Nodes" tab (bridge mode only)
Configurable parameter: MAC address
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6.5 Configuring internal network nodes
"Internal Subnets" tab
In the case of an internal subnet (a router in the internal network), specify the following
address parameters:
Parameter
Function
Example of a value
Network ID
Network ID of the subnet: Based on the network ID, the router
recognizes whether a target address is inside or outside the
subnet.
196.80.96.0
Subnet mask
Subnet mask: The subnet mask structures the network and is used
to form the subnet ID.
255.255.255.0
Router IP
IP address of the router
196.80.96.1
Effects when using the SOFTNET Security Client
If you configure nodes statically as described above when using the SCALANCE S612 /
S613, you will also need to download the configuration for a SOFTNET Security Client used
in the VPN.
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7
With the SOFTNET Security Client PC software, secure remote access is possible from
PCs/PGs to automation systems protected by SCALANCE S via public networks.
This chapter describes how to configure the SOFTNET Security Client in the Security
Configuration Tool and then commission it on the PC/PG.
Further information
You will also find detailed information on the dialogs and parameter settings in the online
help of the SOFTNET Security Client.
F1
You can call this with the F1 key or using the "Help" button in the relevant dialog.
See also
Secure communication in the VPN over an IPSec tunnel (S612/S613) (Page 177)
7.1
Using the SOFTNET Security Client
Area of application - access over VPN
With the SOFTNET Security Client, a PC/PG is configured automatically so that it can
establish secure IPsec tunnel communication in the VPN (Virtual Private Network) with one
or more SCALANCE S devices.
PG/PC applications such as NCM Diagnostics or STEP 7 can then access devices or
networks in an internal network protected by SCALANCE S over a secure tunnel connection.
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7.1 Using the SOFTNET Security Client
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Automatic communication over VPN
For your application, it is important that the SOFTNET Security Client automatically detects
access to the IP address of a VPN node. You address the node simply using the IP address
as if it was located in the local subnet to which the PC/PG with the application is attached.
NOTICE
Please note that only IP-based communication between the SOFTNET Security Client and
SCALANCE S is possible over the IPsec tunnel.
Operation
The SOFTNET Security Client PC software has a straightforward user interface for
configuration of the security properties required for communication with devices protected by
SCALANCE S. Following configuration, the SOFTNET Security Client runs in the
background - visible as an icon in the SYSTRAY on your PG/PC.
Details in the online help
You will find detailed information on the dialogs and input boxes in the online help of the
SOFTNET Security Client user interface.
F1
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7.1 Using the SOFTNET Security Client
You can open the online help with the "Help" button or the F1 key.
How does the SOFTNET Security Client work?
The SOFTNET Security Client reads in the configuration created with the Security
Configuration Tool and obtains the required information on the certificates to be imported
from the file.
The root certificate and the private keys are imported and stored on the local PG/PC.
Following this, security settings are made based on the data from the configuration so that
applications can access IP addresses downstream from the SCALANCE S modules.
If a learning mode for the internal nodes or programmable controllers is enabled, the
configuration module first sets a security policy for the secure access to SCALANCE S
modules. The SOFTNET Security Client then addresses the SCALANCE S modules to
obtain the IP addresses of the relevant internal nodes.
SOFTNET Security Client enters these IP addresses in special filter lists belonging to this
security policy. Following this, applications such as STEP 7 can communicate with the
programmable controllers over VPN.
NOTICE
On a Windows system, the IP security policies are stored separately for specific users. Only
one IP security policy can ever be valid at one time for a user.
If you do not want an existing IP security policy to be overwritten by installing the SOFTNET
Security Client, you should install and use the SOFTNET Security Client under a user
specifically set up for it.
Environment
The SOFTNET Security Client is designed for use with the Windows XP SP2 and SP3 (not
"Home Edition") operating systems and Windows 7 (not "Home Edition").
Response to problems
If problems occur on your PG/PC, SOFTNET Security Client reacts as follows:
● Established security policies are retained when you turn your PG/PC off and on again;
● Messages are displayed if a configuration is not found.
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7.2 Installation and commissioning of the SOFTNET Security Client
7.2
Installation and commissioning of the SOFTNET Security Client
7.2.1
Installing and starting SOFTNET Security Client
You install the SOFTNET Security Client PC software from the SCALANCE S CD.
1. First read the information in the README file of your SCALANCE S CD and follow any
additional installation instructions it contains.
2. Run the Setup program;
The simplest way is to open the overview of the contents of your SCALANCE S CD → this
is started automatically when you insert the CD or can be opened from the start.exe file.
You can then select the entry "Installation SOFTNET Security Client" directly
Following installation and startup of the SOFTNET Security Client, the icon of the SOFTNET
Security Client appears in the Windows taskbar:
Setting up the SOFTNET Security Client
Once activated, the most important functions run in the background on your PG/PC.
The SOFTNET Security Client is configured in two steps:
● Export of a security configuration from the SCALANCE S Security Configuration Tool.
● Import of the security configuration in its own user interface as described in the next
section.
Startup behavior
With a maximum configuration and depending on the system, the SOFTNET Security Client
can require up to 15 minutes to load the security rules. The CPU of the on PG/PC is at 100%
usage during this time.
Exiting SOFTNET Security Client - effects
If SOFTNET Security Client is exited, the security policy is also deactivated.
You can exit SOFTNET Security Client as follows:
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7.3 Creating a configuration file with the Security Configuration Tool
● Using the menu command in the SYSTRAY of Windows; select the icon of the SOFTNET
Security Client with the right mouse button and then select the "Shut down SOFTNET
Security Client" option.
● Using the "Quit" button of the user interface.
7.2.2
Uninstalling SOFTNET Security Client
When you uninstall, the security properties set by the SOFTNET Security Client are reset.
7.3
Creating a configuration file with the Security Configuration Tool
Configuring a SOFTNET Security Client module in the project
The SOFTNET security client is created as a module in the project. In contrast to the
SCALANCE S modules, no further properties can be configured.
You simply assign the SOFTNET Security Client module to one or more module groups in
which you want to set up IPsec tunnels to the PC/PG.
The group properties you configured for these groups are then decisive.
NOTICE
Please refer to the information on the parameters in Section 6.4, subsection "Compatible
settings for SOFTNET Security Client".
Note
If you create several SOFTNET Security Clients within a group, no tunnels are set up
between these clients but only from the relevant client to the SCALANCE S modules!
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7.3 Creating a configuration file with the Security Configuration Tool
Configuration files for the SOFTNET Security Client
The interface between the Security Configuration Tool and the SOFTNET Security Client is
controlled by configuration files.
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The configuration is stored in three file types:
● *.dat
● *.p12
● *.cer
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7.3 Creating a configuration file with the Security Configuration Tool
Procedure
Follow the steps below in the Security Configuration Tool to create the configuration files:
1. First, create a module of the type SOFTNET Security Client in your project.
2. Assign the module to the module groups in which the PC/PG will communicate over
IPsec tunnels.
3. Select the required SOFTNET Security Client with the right mouse button and then select
the following menu command:
Transfer ▶ To Module...
4. In the dialog that appears, select the storage location for the configuration file.
5. If you selected certificate as the authentication method, in the next step you will prompted
to specify a password for the certificate of the VPN configuration. Here, you have the
option of assigning your own password. If you do not assign a password, the project
name is used as the password.
As usual, the password you enter must be repeated.
This completes export of the configuration files.
6. Apply the files of the type *.dat, *.p12, *.cer on the PC/PG on which you want to operate
the SOFTNET Security Client.
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7.4
Working with SOFTNET Security Client
Configurable properties
You can use the following individual services:
● Setting up secure IPsec tunnel communication (VPN) between the PC/PG and all
SCALANCE S modules of a project or individual SCALANCE S modules. The PC/PG can
access the internal nodes over this IPsec tunnel.
● Enable and disable existing secure connections;
● Set up connections when end devices are added later; (only possible when the learning
mode is activated)
● Check a configuration; in other words, which connections are set up or possible.
How to open SOFTNET Security Client for configuration
You open the SOFTNET Security Client user interface by double-clicking on the icon in the
SYSTRAY or with the "Open SOFTNET Security Client" context menu command (right
mouse button):
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With the buttons, you can activate the following functions:
Button
Meaning
Load Configuration Data
Import the configuration
You open a file dialog in which you select the configuration file.
After closing the dialog, the configuration is loaded and you are asked to assign a password
for each configuration file.
In the dialog, you are asked whether you want to set up the tunnels for all SCALANCE S
modules immediately. If IP addresses of SCALANCE S modules are entered in the
configuration or if the learning mode is active, the tunnels for all configured or detected
addresses are set up.
This procedure is fast and efficient particularly with small configurations.
As an option, you can set up all tunnels in the "Tunnel overview" dialog.
Note: You can import the configuration files from several projects created in the Security
Configuration Tool one after the other (see also the explanation of the procedure below).
Tunnel Overview
Dialog for setting up and editing tunnels.
This is the dialog in which you actually configure the SOFTNET Security Client.
In this dialog, you will find a list of the existing secure tunnels.
You can display and check the IP addresses for the SCALANCE S modules.
If you have more than one network adapter on your PG/PC, the SOFTNET Security Client
automatically selects one via which an attempt is made to set up a tunnel. In some cases,
the SOFTNET Security Client does not find an adapter to suit your node and enters any
one of the adapters. In this case, you will need to adapt the network adapter setting
manually in the context menu of the nodes and SCALANCE S modules in the "Network
Adapters" dialog.
Disable
Disable all secure tunnels.
Use case:
If you change the configuration of a SCALANCE S612 / S613 module and download it
again, you should disable the tunnel to the SOFTNET Security Client. This speeds up the
reestablishment of the tunnel.
Minimize
The user interface of the SOFTNET Security Client is closed.
Quit
Quit configuration; SOFTNET Security Client is closed; all tunnels are deactivated.
The icon for the SOFTNET Security Client remains in the Windows taskbar.
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Button
Meaning
Help
Open online help.
Info
Information on the version of the SOFTNET Security Client
Details: List of all the files required for the SOFTNET Security Client to function with
feedback as to whether these could be found on the system.
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7.5 Setting up and editing tunnels
7.5
Setting up and editing tunnels
Setting up secure connections to all SCALANCE S modules
In the dialog for the configuration import, you can select whether or not the tunnels are set
up for all SCALANCE S modules immediately. This results in the following possibilities:
● Enable tunnels automatically
If IP addresses of SCALANCE S modules are entered in the configuration or if the
learning mode is active, the tunnels for all configured or detected addresses are set up.
● Read in tunnel configuration only
As an option, you can simply read in the configured tunnels and then enable them
individually in the dialog.
How to set up tunnel connections
1. With the "Load Configuration Data", open the dialog for importing the configuration file.
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2. Select the configuration file created with the Security Configuration Tool.
3. If configuration data already exists in SOFTNET Security Client, you will be prompted to
decide how to handle the new configuration data. Select from the available options:
Notes on this dialog:
The configuration data can be read in from several projects. This dialog takes this into
account in the options it presents. The options therefore have the following effects:
– If you select "deleted", only the last downloaded configuration data remains.
– The second option "imported and replaced" is useful if you have modified
configuration data, for example, you have only changed the configuration in project a,
projects b and c remain unchanged.
– The third option "not imported" is useful if a SCALANCE S has been added to a
project and you do not want to lose internal nodes that have already been learnt.
4. If you have selected Certificate as the authentication method in the Security Configuration
Tool, you will now be prompted to enter your password.
5. Now decide whether or not to enable the tunnel connections for the nodes included in the
configuration (statically configured nodes).
If you do not enable the tunnel connections here, you can do this at any time in the tunnel
dialog described below.
If you have decided to enable the tunnel connections, the tunnel connections between the
SOFTNET Security Client and the SCALANCE S modules are now established.
This can take several seconds.
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6. Now open the "Tunnel Overview" dialog.
In the table that opens, you will see the modules and nodes with status information on the
tunnel connections.
7. If you now recognize that required nodes or members are not displayed in the table,
follow the steps outlined below:
Open the command prompt and send a PING command to the required node.
As a result of the ping, the SCALANCE S detects the node and passes this information
on to SOFTNET Security Client.
Note:
If the dialog is not open while a node is detected, the dialog is displayed automatically.
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Note
Statically configured nodes and subnets
If you configure nodes or subnets statically when using the SCALANCE S612 / S613, you
will also need to download the configuration for a SOFTNET Security Client used in the
VPN.
8. Activate the nodes for which the status display indicates that no tunnel connection has
yet established.
Once the connection has been established, you can start your application - for example
STEP 7 - and establish a communication connection to one of the nodes.
NOTICE
If you have more than one network adapter on your PG/PC, the SOFTNET Security
Client automatically selects one via which an attempt is made to set up a tunnel. In
some cases, the SOFTNET Security Client does not find an adapter to suit your project
and enters any one of the adapters. In this case, you will need to adapt the network
adapter setting manually using the context menu of the nodes and SCALANCE S
modules.
Meaning of the parameters
Table 7- 1
Meaning of the parameters in the "Tunnel Overview" dialog box
Parameter
Meaning / range of values
Status
You will find possible status displays in Table 7–2
Name
Name of the module or the node taken from the configuration
created with the Security Configuration Tool.
IP address int. / subnet
IP address of the internal node or network ID of the internal subnet
if internal nodes/subnets exist
Tunnel endpoint IP
IP address of the assigned SCALANCE S module or MD741-1
module
Tunnel over..
If you are using more than one network adapter in your PC, the
assigned IP address is displayed here.
Table 7- 2
Symbol
Status displays
Meaning
There is no connection to the module or node.
There are more nodes to be displayed. Double-click on the symbol to display further
nodes.
The node cannot be activated.
The node is activated.
Disabled SCALANCE S module.
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Symbol
Meaning
Enabled SCALANCE S module.
Deactivated MD741-1 module.
Activated MD741-1 module.
Module / node cannot be reached.
Module / node can be reached.
"enable active learning" check box
If the learning mode has been enabled in the configuration of the SCALANCE S modules,
you can also use the learning mode for the SOFTNET Security Client; You then obtain the
information from the SCALANCE S modules automatically.
Otherwise the "Activate learning mode" is inactive and grayed out.
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Selecting and working with a tunnel entry
In the "Tunnel" dialog, you can select an entry and open several menu commands with the
right mouse button.
NOTICE
If several IP addresses are used for a network adapter, you may need to assign the IP
address you want to use in the "Tunnel" dialog for each individual entry.
"Delete All" button
This deletes the IP security policy completely including additional entries not set up by
SOFTNET Security Client.
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Enabling and disabling existing secure connections
You can disable existing secure connections with the "Disable" button. If you click the button,
the text in the button changes to "Activate" and the icon in the status bar is replaced.
The security policy is now deactivated on the PC.
If you click on the button again, you can undo the change you made above and the tunnels
are enabled again.
Logging Console
The Logging Console is in the lower part of the "Tunnel Overview" dialog and supplies
diagnostics information on the connection establishment with the configured SCALANCE S /
MD741-1 modules and internal nodes / subnets.
The times of relevant events can be recorded with a date and time stamp.
The establishment and termination of a security association is shown. The result of a test
ping (reachability test) to the configured nodes is displayed it the result is negative.
You can configure what is displayed in the "Settings" dialog.
"Clear" button
If you click this, you delete the entries from the logging console of the tunnel overview.
Global settings for the SOFTNET Security Client
Open the following menu item in the main dialog of the SOFTNET Security Client:
Options ▶ Settings
Here, you can make global settings that are retained after exiting and re-opening the
SOFTNET Security Client.
You will find the functions in the following table:
Function
Description / options
Log file size (logging console)
Log file size of the source file containing the
messages that are output filtered in the logging
console and are restricted to a specific number.
Number of messages to be displayed in the
logging console of the tunnel overview.
Number of messages that will be extracted from
the log file of the source file and displayed in the
logging console.
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Output the following log messages in the logging
console of the tunnel overview:

Display of the negative reachability test (ping)

Creation/deletion of security associations
(quick modes)

Creation / deletion of main modes

Download configuration files

Learn internal nodes
Messages that are displayed optionally in the
logging console can be enabled and disabled
here
Log file size (debug log files)
Log file size of the source files for debug
messages of the SOFTNET Security Client (can
be requested from Customer Support to make
analyses easier)
Reachability test, wait time for reply
Selectable wait time for a ping that will establish
whether a tunnel partner can be reached. It is
important to make this setting especially for
tunnels over slow transmission paths (UMTS,
GPRS, etc.) on which the delay of the data
packets is significantly higher.
This therefore directly influences the display of
the reachability in the tunnel overview.
Note
For wireless networks, select a wait time of at
least 1500 ms.
Disable reachability test globally
If you enable this function, the reachability test is
disabled globally for all the configurations
contained in the SOFTNET Security Client. This
has the advantage that no additional packets to
create extra data volume and the disadvantage
that in the tunnel overview you no longer receive
feedback to tell you whether or not a tunnel
partner can be reached.
Expanded module diagnostics
Open the following menu item in the main dialog of the SOFTNET Security Client:
Options ▶ Advanced Module Diagnostics
Here, you can obtain the status of your system in terms of a configured module. This view is
intended solely for diagnostics of your system status and can be helpful if have a query for
Customer Support.
● SCALANCE S / MD741-1 module
Here, select the module for which you want to diagnose the current system status.
● Routing settings (module-specific parameters)
Here, you can see settings of the module relating to its interfaces and internal
nodes/subnets obtained from the configuration.
● Active main modes / active quick modes
Here, you can see the active main modes or quick modes in detail as soon as they have
been set up for the selected module on the PG/PC.
You can also see how many main modes or quick modes suitable for the selected
module were found on the system.
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● Routing settings (network settings of the computer)
Here, you can see the current routing settings of your computer.
With the "Show all routing settings" option, you can also show the routing settings that
were hidden to make the display clearer to read.
● Assigned IP addresses
Here, you have a list of the network interfaces known to your computer in conjunction
with the configured or assigned IP addresses.
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Online functions - test, diagnostics, and logging
8
For test and monitoring purposes, SCALANCE S has diagnostic and logging functions.
● Diagnostic functions
These include various system and status functions that you can use in online mode.
● Logging functions
This involves the recording of system and security events.
The events are logged in the buffer area of the SCALANCE S or a server These functions
can only be assigned parameters and evaluated when there is a network connection to the
selected SCALANCE S module.
Recording events with logging functions
You select the events to be logged in the log settings for the relevant SCALANCE S module.
You can configure the following variants for logging:
● Local log
In this variant, you log events in the local buffer of the SCALANCE S module. You can
then access these logs, display them and archive them on the service station in the
online dialog of the Security Configuration Tool.
● Network Syslog
With Network Syslog, you use a Syslog server that exists in the network. This logs the
events according to the configuration in the log setting for the relevant SCALANCE S
module.
Further information
For detailed information on the dialogs and the parameters recorded in diagnostics and
logging, please refer to the online help of the Security Configuration Tool.
F1
You can call this with the F1 key or using the "Help" button in the relevant dialog.
See also
Overview of the functions in the online dialog (Page 220)
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8.1 Overview of the functions in the online dialog
8.1
Overview of the functions in the online dialog
In the Security Configuration Tool, SCALANCE S provides the following functions in the
online dialog:
Table 8- 1
Functions and logging in online diagnostics
Function / tab in the
online dialog
Meaning
System and status functions
Status
Display of the device status of the SCALANCE S module selected in the
project.
Communications status
(S612/S613)
Display of the communication status and the internal nodes for other
SCALANCE S modules belonging to the VPN group.
Date and time
Date and time setting.
Internal nodes
(S612/S613)
Display of the internal nodes of the SCALANCE S module.
Logging functions
System Log
Display of logged system events.
Audit Log
Display of logged security events.
Packet Filter Log
Displays logged data packets as well as starting and stopping packet
logging.
Note: Please read the notes on the device types.
Requirements for access
Before you can run the online functions on a SCALANCE S module, the following
requirements must be met:
● The online mode is activated in the Security Configuration Tool
● There is a network connection to the selected module
● The corresponding project with which the module was configured is open
Opening the online dialog
Switch over the mode of the Security Configuration Tool with the following menu command:
View ▶ Online
Select the module you want to edit and then select the following menu command to open the
online dialog
Edit ▶ Online Diagnostics...
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Warning if the configuration is not up-to-date or the wrong project has been selected
When you open the online dialog, the program checks whether the current configuration on
the SCALANCE S module matches the configuration of the loaded project. If there are
differences between the two configurations, a warning is displayed. This signals that you
have either not yet updated the configuration or have selected the wrong project.
Online settings are not saved in the configuration
Settings you make in online mode are not saved in the configuration on the SCALANCE S
module. Following a module restart, the settings in the configuration are therefore always
effective.
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8.2 Logging events
8.2
Logging events
Overview
You can record events on the SCALANCE S. Depending on the event type, they are stored
in volatile or non-volatile buffers. As an alternative, you can also record on a network server.
Configuration in standard and in advanced mode
When logging, the options available in the Security Configuration Tool also depend on the
selected view:
● Standard mode
The local log is enabled as default in standard mode; packet filter events can be enabled
globally in the "Firewall" tab. Network Syslog is not possible in this view.
● Advanced mode
All logging functions can be enabled or disabled individually; packet filter events must be
enabled selectively in the "Firewall" tab (local or global rules).
Logging procedures and event classes
During configuration, you can specify which data should be logged. As a result, you enable
logging as soon as you download the configuration to the SCALANCE S module.
During configuration, you also select one or both of the possible logging procedures:
● Local log
● Network Syslog
In both logging procedures, the SCALANCE S recognizes the three following types of
events:
Table 8- 2
Logging - overview of the selectable events
Function / tab in the online dialog
How it works
Packet filter events (firewall) /
packet filter log
The packet filter log records certain packets from the data traffic. Data packets are
only logged if they match a configured packet filter rule (firewall) or to which the basic
protection reacts (corrupt or invalid packets). This is only possible when logging is
enabled for the packet filter rule.
Audit events / audit log
The audit log automatically logs successive security-relevant events. This would
include, for example, enabling or disabling packet logging or actions when users did
not authenticate themselves correctly with a password.
System events / system log
The system log automatically logs successive system events, for example the start of
a process. The logging can be scaled based on event classes.
Line diagnostics can also be configured. Line diagnostics returns messages as soon
as the number of bad packets exceeds a selectable limit.
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Storage of logged data in local logging
There are two options for storage of recorded data:
● Ring buffer
At the end of the buffer, the recording continues at the start of the buffer and overwrites the
oldest entries.
● One-shot buffer
Recording stops when the buffer is full.
Enabling or disabling logging
In offline mode, you can enable local logging for the event classes in the log settings and can
select the storage mode. These log settings are loaded on the module with the configuration
and take effect when the SCALANCE S starts up.
When required, you can also enable or disable local logging of packet filter events and
system events in the online functions. This does not change the settings in the project
configuration.
8.2.1
Local log - settings in the configuration
In offline mode, you can enable the event classes in the log settings and can select the
storage mode. These log settings are loaded on the module with the configuration and take
effect when the SCALANCE S starts up.
If necessary, you can modify these configured log settings in the online functions. This does
not change the settings in the project configuration.
Log settings in standard mode
The log settings in standard mode correspond to the defaults in advanced mode. In standard
mode, however, you cannot change the settings.
Log settings in advanced mode
Select the module you want to edit and then the following menu command:
Edit ▶ Properties ..., "Log Settings" tab
The following dialog shows the standard settings for SCALANCE S; the dialog is also
opened to configure the logging of system events:
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Configuring event classes
Table 8- 3
Local log - overview of the functions
Function / tab in the
online dialog
Project engineering
Packet filter events
(firewall) / packet filter
log
(configurable)
You enable options using the check boxes.
Audit events / Audit log
(always enabled)
Logging is always enabled.
Remarks

You select the storage mode using the check
boxes.
The logged information is always stored in the
ring buffer.
Packet filter log data is not retentive
The data is stored in volatile memory on
the SCALANCE S and is therefore no
longer available after the power supply
has been turned off.

Audit log data is retentive
The audit log data is saved in retentive
memory on the SCALANCE S. The data
of the audit log is therefore available after
turning off the power supply.
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Function / tab in the
online dialog
Project engineering
System events / System You enable options using the check boxes.
log
You select the storage mode using the check
(configurable)
boxes.
To configure the event filter and line diagnostics,
open a further dialog with the "Configure..."
button.
In this dialog, you set a filter level for the system
events. As default, the highest level is set so that
only critical events are logged.
Remarks

The system log data is saved in volatile
memory on the SCALANCE S. This data
is therefore no longer available after the
power supply has been turned off.

Line diagnostics generates a special system
event. A system event is generated when a user
defined percentage of bad packets is reached.
This system event is assigned the priority and
significance (facility) that can be set in this
dialog.
8.2.2
System log data is not retentive
Filtering system events
Select "Error" as the filter level or a higher
value to exclude logging of general,
uncritical events.
Priority of the system events of line
diagnostics
Make sure that you do not assign a lower
priority to the the system events of line
diagnostics than for the filter. At a lower
priority, these events will not pass
through the filter and will not be logged.
Network Syslog - settings in the configuration
You can configure SCALANCE S so that it sends Syslog information as a client to a Syslog
server. The Syslog server can be in the internal or external subnet. The implementation
corresponds to RFC 3164.
Note
Firewall - Syslog server not active in the external network
If the Syslog server is not enabled on the addressed computer, this computer generally
returns ICMP responses "port not reachable". If these reply packets are logged due to the
firewall configuration and sent to the Syslog server, the procedure can become never ending
(storm of events).
Remedies:
 Start the Syslog server;
 Change the firewall rules;
 Take the computer with the disabled Syslog server out of the network;
Switch over to advanced mode
Configuration of the Syslog server is possible only in "Advanced mode" in the Security
Configuration Tool. Change the mode using the following menu command:
View ▶ Advanced Mode
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Making the logging settings
Select the module you want to edit and then the following menu command:
Edit ▶ Properties... , "Log Settings" tab.
The following dialog shows the standard settings for SCALANCE S when logging is enabled
for the network Syslog:
Establishing a connection to the Syslog server
SCALANCE S uses the configured module name as the host name to identify itself with the
Syslog server. You will need to specify the IP address of the Syslog server. You can enter
the IP address either as a symbolic name or as a numeric name.
The Syslog server must be reachable from the SCALANCE S using the specified IP address,
if necessary using the router configuration in the "Network" tab. If the Syslog server cannot
be reached, the sending of Syslog information is disabled. You can recognize this operating
situation based on the system messages. To enable the sending of Syslog information
again, you may need to update the routing information and restart SCALANCE S.
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Use symbolic names in log
You can replace the address information in the log packets transferred to the Syslog server
by symbolic names. If the option is enabled, SCALANCE S checks whether corresponding
symbolic names are configured and enters them in the log packet. Note that this increases
the processing time on the SCALANCE S module.
The module names are automatically used as symbolic names for the IP addresses of the
SCALANCE S modules. In routing mode, these names have a port name added to them as
follows: "Modulename-P1", "Modulename-P2" etc.
Configuring event classes
Table 8- 4
Network Syslog - overview of the functions
Function / tab in the
online dialog
Packet filter events
(firewall) / packet filter
log
(configurable)
Project engineering
You enable options using the check boxes.
You assign the priority and significance (facility)
from drop-down list boxes. Each event is
assigned the priority and significance (facility)
that you set here.
Remarks
The value you select here for the priority and
significance (facility), depends on the
evaluation in the Syslog server. This allows
you to adapt to the requirements in the
Syslog server.
Defaults:
Facility: 10 (security/auth)
Prio: 5 (Notice)
Audit events / Audit log
(always enabled)
You enable options using the check boxes.
You assign the priority and significance (facility)
from drop-down list boxes. Each event is
assigned the priority and significance (facility)
that you set here.
The value you select here for the priority and
significance (facility), depends on the
evaluation in the Syslog server. This allows
you to adapt to the requirements in the
Syslog server.
Defaults:
Facility: 13 (log audit)
Prio: 6 (Informational)
System events / System You enable options using the check boxes.
log
To configure the event filter and line diagnostics,
(configurable)
open a further dialog with the "Configure..."
button.
In this dialog, you set a filter level for the system
events. As default, the highest level is set so that
only critical events are logged.
Line diagnostics generates a special system
event. A system event is generated when a userdefined percentage of bad packets is reached.
This system event is assigned the priority and
significance (facility) that can be set in this
dialog.

Filtering system events
Select "Error" as the filter level or a higher
value to exclude logging of general,
uncritical events.

Priority of the system events of line
diagnostics
With the priority, you can weight the
system events of line diagnostics relative
to the priority of the other system events.
Make sure that you do not assign a lower
priority to the the system events of line
diagnostics than for the filter. At a lower
priority, these events will not pass
through the filter and will not reach the
Syslog server.
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Online functions - test, diagnostics, and logging
8.2 Logging events
8.2.3
Configuring packet logging
The packet filter log records the data packets for which you activated logging in a packet
filter rule (firewall) in the configuration. Activation must therefore be configured.
Configuration differs depending on the operating view. While in standard mode, logging can
only be enabled for a few predefined, fixed sets of rules, in advanced mode, it can be
enabled for individual packet filter rules.
Configuring in standard mode
In standard mode, there are the following sets of rules for IP and MAC log settings that can
be enabled for logging:
Table 8- 5
IP and MAC log settings
Rule
Action on activation
Log passed packets
All MAC packets that were forwarded are logged.
Log dropped incoming packets
All incoming IP / MAC packets that were dropped are logged.
Log dropped outgoing packets
All outgoing IP / MAC packets that were dropped are logged.
Log tunneled packets
All IP packets that were forwarded via the tunnel are logged.
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8.2 Logging events
Configuring in advanced mode
Enabling logging is identical for both rule types (IP or MAC) and all rules.
To log data packets of specific packet filter rules, put a check mark in the "Log" column in the
"Firewall" tab.
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Tips and help on problems
A.1
A
SCALANCE S module does not boot correctly
If the fault LED of the SCALANCE S module is lit red after booting, you should first
completely reset the module. Press the reset button until the fault LED starts to flash yellowred. The module is then reset to the factory settings. For productive operation, you must then
download the configuration to the module again.
If the fault display of the SCALANCE S module continues to be lit red, however, the module
can only be repaired in the factory.
A.2
SCALANCE S module cannot be reached
If the SCALANCE S module cannot be reached, check or note the following:
● Is your computer in the same network as the module?
● Resetting a module can take several minutes.
A.3
Replacing a SCALANCE S module
A SCALANCE S module can be replaced without a PC (without needing to download the
configuration to the new module). The C-PLUG of the module you are replacing is simply
inserted in the new module you want to commission.
NOTICE
The C-PLUG may only be inserted or removed when the power is off!
A.4
SCALANCE S module is compromised
A SCALANCE S module is compromised when
● the private key belonging to the server certificate,
● the private key of the CA or
● the password of a user has become known.
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Tips and help on problems
A.5 Key from the configuration data compromised or lost
Private key of the server certificate known
If the private key belonging to the server certificate has become known, the server certificate
on the SCALANCE S module must be replaced. The user names stored on the SCALANCE
S module do not need to be changed.
Follow the steps below:
1. Select the module you want to edit and then the menu command
Edit ▶ Properties..., "Certificate" tab.
2. Generate a new certificate.
3. Download the configuration to the SCALANCE S module.
The private key of the CA is known
If the private key of the CA has become known, the certificate of the CA must be replaced on
the SCALANCE S module. The user names can remain unchanged. The users do, however,
require new certificates provided by the new CA.
Follow the steps below:
1. Select the group you want to edit and then the menu command
Edit ▶ Properties....
2. Generate a new certificate.
3. Download the configuration to all SCALANCE S modules that belong to the group.
Password of a user from the user group is known
If the password of a user from the user group has become known, the password of this user
must be changed.
Password of a user from the administrator group is known
If the user belongs to the administrators group, the server certificate of the SCALANCE S
module should also be changed.
A.5
Key from the configuration data compromised or lost
Key compromised
If a private key from the configuration data of the SCALANCE S module is compromised, the
key must be changed using the configuration tool of the SCALANCE S module.
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Tips and help on problems
A.6 General operational response
Loss of the key
If the private key that authorizes access to the configuration data is lost, it is no longer
possible to access the SCALANCE S module with the configuration tool. The only possibility
to regain access is to delete the configuration data and therefore also the key. You can
delete this information by pressing the reset button. Following this, the SCALANCE S
module must be taken into operation again.
A.6
General operational response
Adaptation of the MTU (Maximum Transmission Unit)
The MTU specifies the permitted size of a packet for transfer in the network. When these
data packets are now transferred by SCALANCE S over the IPsec tunnel, the original packet
becomes larger due to the addition of header information and it may be necessary to
fragment it for further transmission. This depends on the specified MTU in the connected
network. If fragmentation becomes necessary, this can lead to a noticeable loss of
performance or even break down of the data transmission.
You can avoid this by adapting to the MTU format; in other words, reducing packet size so
that the packets arriving at the SCALANCE S can have the required additional information
added without fragmentation being necessary. A practical size is between 1000 and 1400
bytes.
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A.6 General operational response
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B
Notes on the CE Mark
Product name
SIMATIC NET
SCALANCE S602
6GK5602-0BA00-2AA3
SIMATIC NET
SCALANCE S612
6GK5612-0BA00-2AA3
SIMATIC NET
SCALANCE S613
6GK5613-0BA00-2AA3
EMC directive
89/336/EEC "Electromagnetic Compatibility"
Area of application
The product is designed for use in an industrial environment:
Area of application
Industrial area
Requirements
Emission
Immunity
EN 61000-6-4 : 2001
EN 61000-6-2 : 2001
Installation guidelines
The product meets the requirements if you keep to the installation instructions and safetyrelated notices as described here and in the manual "SIMATIC NET Industrial Ethernet
Twisted Pair and Fiber Optic Networks" /1/ when installing and operating the device.
Conformity certificates
The EC Declaration of Conformity is available for the responsible authorities according to the
above-mentioned EC Directive at the following address:
Siemens Aktiengesellschaft
Bereich Automatisierungs- und Antriebstechnik
Industrielle Kommunikation (A&D SC IC)
Postfach 4848
D-90327 Nürnberg
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Notes on the CE Mark
Notes for the manufacturers of machines
This product is not a machine in the sense of the EC Machinery Directive. There is therefore
no declaration of conformity relating to the EC Machinery Directive 89/392/EEC for this
product.
If the product is part of the equipment of a machine, it must be included in the procedure for
obtaining the declaration of conformity by the manufacturer of the machine.
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References
C
/1/
SIMATIC NET Industrial Twisted Pair and Fiber Optic Networks, Release 05/2001
Order numbers:
6GK1970-1BA10-0AA0 German
6GK1970-1BA10-0AA1 English
6GK1970-1BA10-0AA2 French
6GK1970-1BA10-0AA4 Italian
/2/
The GPRS/GSM Modem SINAUT MD740-1 system manual is available at:
http://support.automation.siemens.com/WW/view/de/23940893
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References
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Dimension drawing
Figure D-1
D
Drilling template
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Dimension drawing
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Document history
E.1
E
Document history
This was new in issue 02 of this manual
● New SCALANCE S602 module
SCALANCE S602 makes a further module available providing scalable security
functionality. SCALANCE S602 protects with the Stateful Inspection Firewall, NAT/NAPT
routing, DHCP server and Syslog.
This was new in issue 03 of this manual
● Routing mode with the SCALANCE S612 / S613
The SCALANCE S modules S612 and S613 are available with enhanced functionality;
they now also support NAT/NAPT routing, DHCP server and syslog.
● Security Configuration Tool V2.1
You can use the new version of the configuration tool to configure the S612 / S613
modules with their new functions.
● Configuration data for MD 740-1
To configure an external MD 740-1 you can create configuration data with the new
version of the Security Configuration Tool.
This was new in issue 04 of this manual
- Issue was not published -
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Document history
E.1 Document history
This was new in issue 05 of this manual
This issue included descriptions of the following new functions:
● Security Configuration Tool V2.2
A SOFTNET Security Client can be configured in routing mode along with a SCALANCE
S. (GETTING STARTED example – remote access)
Apart from the direct internal subnet connected to the SCALANCE S, other subnets can
also be configured in routing mode making them accessible.
● SOFTNET Security Client V2.0
In the Tunnel Overview, a text box with diagnostic information on the connection
establishment has been added.
The network adapter setting has been simplified with the addition of a new automatic
function. When it starts up, the SOFTNET Security Client automatically attempts to find a
suitable network adapter setting.
● Configuration data for module MD 741-1
To configure an external MD 741-1 you can create configuration data with the new
version of the Security Configuration Tool.
This was new in issue 06 of this manual
● SOFTNET Security Client V3.0
Apart from the operating systems Windows XP SP2 and Windows XP SP3, the Windows
7 operating system is also supported (not the Home version).
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Glossary / abbreviations and acronyms
AAA
AAA is an acronym for a security concept and stands for Authentication, Authorization and
Accounting.
AES
Advanced Encryption Standard
A symmetrical block cipher. It can be selected with SCALANCE S to encrypt data.
ARP
Address Resolution Protocol
A protocol used for address resolution. Its task is to find the corresponding network hardware
address (MAC address) for a given protocol address. An ARP protocol implementation is
often found on hosts on which the Internet protocol family is used. IP forms a virtual network
on the basis of IP addresses. These must be mapped to the given hardware addresses
when the data is transported. To achieve this mapping, the ARP protocol is often used.
Bandwidth
Maximum throughput of a connecting cable (normally specified in bps).
BDC
Backup Domain Controller
The backup domain controllers have a backup copy of the user and logon data that is
updated at regular intervals.
BRI
Basic Rate Interface
Standard network connection to ISDN.
CA
Certification Authority
Certification authority for authentication and encryption and decryption of confidential data
transmitted via the Internet and other networks, for example by issuing and signing digital
certificates.
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Glossary / abbreviations and acronyms
CA certificate
A certificate authority (CA) is an organization that issues digital certificates. For
communication in computer networks, a digital certificate is the equivalent of an identity card.
A certificate authority issues certificates to network users and attests them.
With SCALANCE S, a CA certificate is generated for each group. The group issues
certificates to the group members and attests them with the group certificate (group
certificate = CA certificate).
CHAP
Challenge Handshake Authentication Protocol
Authentication protocol used within the framework of the Point-to-Point Protocol (PPP). PPP
is located at the data link layer in the Internet protocol family.
Client
A client is a device, or more generally an object, that requests a -> server to provide a
service.
CTRL
The control field (CTRL) contains control information for the LLC protocol. Logical Link
Control (LLC) is the name of a network protocol standardized by the IEEE. It is a protocol
mainly intended for data reliability in the data link layer and therefore belongs to layer 2 of
the OSI model.
Data Encryption Standard
Method for encrypting data (56-bit encryption)
DCP
Discovery and basic Configuration Protocol
A protocol that is suitable for obtaining address parameters from PROFINET components.
DES
Data Encryption Standard
A symmetrical encryption algorithm
DES3
Data Encryption Standard
A symmetrical encryption scheme; in other words the same key is used to encode and
decode the data. DES3 means that the algorithm is used three times to increase security.
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Glossary / abbreviations and acronyms
DHCP
Dynamic Host Configuration Protocol
You can operate SCALANCE S on the internal network as a DHCP server. This allows IP
addresses to be assigned automatically to the devices connected to the internal network.
The IP addresses are assigned either dynamically from an address band you have specified
or you can select a specific IP address for a particular device.
Diffie-Hellmann groups
Selectable cryptographic algorithms in the Oakley key determination protocol
Diffie-Hellmann key agreement
Protocol for secure exchange of secret keys over an unsecure line.
DMZ
Demilitarized Zone
Computer network with security controlled access options to the connected servers.
Encapsulating Security Payload
Protocol for secure data transmission
ESP
Encapsulating Security Payload
The ESP protocol provides authenticity, integrity and confidentiality of the transferred data.
With ESP, it is also possible to have only the authenticity of data checked or to have only the
data encrypted. With SCALANCE S, ESP is always used with authentication check and
encryption.
HTTPS
Secure Hypertext Transfer Protocol or HyperText Transfer Protocol Secured Socket Layer
(SSL)
Protocol for transmission of encrypted data. Expansion of HTTP for secure transmission of
confidential data with the aid of SSL.
ICMP
Internet Control Message Protocol
is an auxiliary protocol of the IP protocol family and is based on the IP protocol. It is used to
exchange information and error messages.
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Glossary / abbreviations and acronyms
ICMP Echo Request
Outgoing ping packet to check whether a network node can be reached.
ICMP subnet broadcast
To find the IP nodes in an internal network, SCALANCE S sends an ICMP echo request with
the IP subnet broadcast address, in other words, an address that contacts all IP nodes in the
internal subnet of the SCALANCE S.
Identity protection
The difference between main and aggressive mode is the "identity protection" used in main
mode. The identity is transferred encrypted in main mode but not in aggressive mode.
IKE
Internet Key Exchange
Protocol for automatic key management for IPsec. IKE works in two phases. In the first
phase, the two nodes requiring secure communication identify themselves. Authentication is
achieved either using certificates or using pre shared keys. In the second phase, the keys for
data communication are exchanged and the encryption algorithms selected.
Internet Key Exchange (IKE)
Protocol for establishing an IPsec tunnel. Here, you can set parameters for the protocol of
the IPsec key management. The key exchange uses the standardized IKE method. (IKE
settings)
IP subnet ID
Network ID of the subnet: Based on the network ID, the router recognizes whether a target
address is inside or outside the subnet.
IP traffic
Term for communication in computer networks using the IP protocol as the network protocol.
IP/MAC service definition
Using the IP service definitions, you can define succinct and clear firewall rules. You select a
name and assign the service parameters to it.
These services defined in this way can also be grouped together under a group name. When
you configure the packet filter rule, you simply use this name.
ISAKMP
Internet Security Association and Key Management Protocol
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Glossary / abbreviations and acronyms
Protocol for establishing Security Associations (SA) and exchange of cryptographic keys on
the Internet.
ISO network nodes
Network nodes without IP capability but that can be addressed over ISO protocols.
ISP
Internet Service Provider
Provider of Internet services
L2F
Layer 2 Forwarding
Network protocol (similar to PPTP) that supports various protocols and multiple independent
tunnels.
L2TP
Layer 2 Tunneling Protocol
Network protocol that tunnels frames of protocols of the data link layer (layer 2) of the OSI
model between two networks via the Internet to establish a virtual private network (VPN).
Logging
Events can be recorded. They are recorded in logs (log files). Even during configuration, you
can specify which data will be recorded and whether the recording is activated when the
configuration is loaded.
MAC packet filter rule
Using MAC packet filter rules, you can filter for MAC frames.
MAC protocol
Controls access to a transmission medium
Maximum Transmission Unit
MTU
Specifies the permitted size of a data packet for transmission on the network.
MD
Message Digest
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Glossary / abbreviations and acronyms
Name of a group of cryptographic protocols.
MD5
Message Digest Version 5
A widely used cryptographic hash function. MD5 is used by numerous security applications
to verify the integrity of data. With SCALANCE S, MD5 can be selected to check the integrity
of the data transmitted in a tunnel.
MDI / MDI-X autocrossover function
The advantage of the MDI /MDI-X autocrossover function is that straight-through cables can
be used throughout and crossover Ethernet cables are unnecessary. This prevents
malfunctions resulting from mismatching send and receive wires. This makes installation
much easier for the user.
NAPT
Network Address Port Translation
A procedure with which an IP address is replaced on the router by another address and the
port number by another port number.
NAT
Network Address Translation
A routine with which an IP address in a message is replaced on the router by another.
NAT traversal
Is a method with which IPsec data can traverse NAT devices.
NAT/NAPT router
With this technique, you can avoid addresses of node in the internal subnet becoming known
in the external network. They are visible in the external network only over the external IP
addresses defined in the translation list.
OAKLEY Key Determination protocol
The OAKLEY Key Determination protocol describes the generation of secret key material. It
is part of the Internet Key Exchange protocol (IKE).
One-shot buffer
Recording stops when the buffer is full.
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Glossary / abbreviations and acronyms
Organizationally Unique Identifier
Name for the first 3 bytes of the MAC address = vendor ID.
OUI
Organizationally Unique Identifier
24-bit number issued by the IEEE Registration Authority to companies. Companies use the
OUI for various hardware products among other things as the first 24 bits of the MAC
address.
Packet filter rule
Using packet filter rules, you decide whether or not a data packet is allowed to pass through
the packet filter. The decision as to whether a packet may pass or not is made based on the
protocol fields. Examples of protocol fields are the IP source or the IP destination address.
On the SCALANCE S, filter rules can be set for MAC or IP protocols.
PAP
Password Authentication Protocol
Password authentication protocol
PEM
Privacy Enhanced Mail; Privacy Enhanced Mail
is a standard for the encryption of e-mails on the Internet
Perfect Forward Secrecy
Perfect Forward Secrecy
makes sure that new key negotiations are not based on previous keys. Disabling the option
means faster but less secure encryption.
PGP
Pretty Good Privacy
is a program for encryption and for adding a signature to data.
Ping
A test protocol belonging to the IP protocol family. This protocol exists on every MS Windows
computer under the same name as a console application (command prompt level). With
"Ping", you can prompt a reply (sign of life) from an IP network node within a network as long
as you know its IP address. You can find out whether this network node can be reached at
the IP level and therefore check the effectiveness of the configured SCALANCE S
functionality.
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Glossary / abbreviations and acronyms
PKCS
Public Key Cryptography Standards
are specifications for cryptographic keys developed by RSA Security and others. A certificate
links data of a cryptographic key (or key pair consisting of a public and private key) with data
of the owner and a certification issuer.
PKCS#12 format
The standard specifies a PKCS format suitable for exchange of the public key and an
additional password-protected private key.
PKI
Public Key Infrastructure
In cryptology, this describes a system that allows digital certificates to be issued, distributed
and checked. The certificates issued within a PKI are used for the security of computersupported communication.
PoP
Point of Presence
Dial-in node of an Internet provider
PPP
Point-to-Point Protocol
PPTP
Point-to-Point Tunneling Protocol
is a protocol for establishing a Virtual Private Network (VPN). It allows tunneling of PPP
through an IP network.
Preshared keys
Designates a symmetric key method. The key must be known at both ends prior to
communication. This key is also generated automatically when a group is created. However,
you must first enter a password in the "Key" box in the Security Configuration Tool "Group
Properties" dialog from which the key is generated.
PST (tool)
Primary Setup Tool
With the Primary Setup Tool (PST), you can assign an address (for example an IP address)
to SIMATIC NET network components, SIMATIC NET Ethernet CPs and gateways.
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Glossary / abbreviations and acronyms
PSTN
Public Switched Telephone Network
Public communications system for voice traffic between remote subscribers.
Public key method
The purpose of encryption methods with public keys is to avoid all security risks when
mutually exchanging keys. Each has a pair of keys with a public and a secret key. To encrypt
a message, you use the public key of the recipient and only the recipient can decrypt the
message using its secret key.
RAS
Remote Access Service
With the Remote Access Service, you have the option of connecting clients via a modem,
ISDN, or X.25 connection to the local area network. Not only different clients are supported
but there is also great flexibility in the selection and possible combinations of the network
protocols used.
RSA
Rivest, Shamir & Adleman Algorithm
is an asymmetrical cryptography system that can be used both for encryption and for digital
signatures. It uses a pair of keys consisting of a private key that is used to decode or sign
data and a public key for encryption and checking signatures. The private key is kept secret
and cannot be calculated from the public key or at least not without considerable effort.
Secure Hash Algorithm 1
Algorithm for verifying data
Security Configuration Tool
SCT
Configuration tool for SCALANCE S products.
Server
A server is a device, or more generally an object, that can provide certain services; the
service is provided when requested by a -> client.
Services
Services provided by a communication protocol.
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Glossary / abbreviations and acronyms
SHA1
Secure Hash Algorithm 1
A widely used cryptographic hash function. With SCALANCE S, SHA1 can be selected to
check the integrity of the data transmitted in a tunnel.
SIMATIC NET
Siemens SIMATIC Network and Communication. Product name for networks and network
components from Siemens. (previously SINEC)
SNAP
Subnetwork Access Protocol
Mechanism for multiplexing protocols in networks that use IEEE 802.2 LLC.
SOHO
Small Office, Home Office
SSL certificate
SSL certificates are used for authentication of communication between
PG/PC and SCALANCE S when downloading the configuration and when logging.
SSL connection
The SSL protocol is located between the TCP (OSI layer 4) and the transmission services
(such as HTTP, FTP, IMAP etc.) and is used for a secure transaction. With SSL, the user is
sure that it is connected to the required server (authentication) and that the sensitive data is
transferred over a secure (encrypted) connection.
SSN = DMZ
Secure Server Net = Demilitarized Zone
Stateful packet inspection
Stateful Inspection (also known as Stateful Packet Filter or Dynamic Packet Filter) is a
firewall technology that operates both on the network and at the application layer. The IP
packets are accepted on the network layer, inspected according to their state by an analysis
module and compared with a status table. For the communication partner, a firewall with
stateful inspection appears as a direct cable that only allows communication according to the
rules.
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Glossary / abbreviations and acronyms
Syslog
A service on a server (Syslog-Server) that receives system messages and, for example,
records them in log files.
TACACS
Terminal Access Controller Access Control System; the Terminal Access Controller Access
Control System (TACACS) is an AAA protocol. It is used for client-server communication
between AAA servers and a Network Access Server (NAS). TACACS servers provide a
central authentication instance for remote users that want to establish an IP connection to an
NAS.
Tunnel
A tunnel or tunneling means the use of the communications protocol of a network service as
a vehicle for data that does not belong to this service.
VLAN identifier
An Ethernet packet has a VLAN identifier if a field in the Ethernet packet header (EtherType)
has a certain value. In this case, the Ethernet packet header contains information on the
virtual LAN and possibly also a packet priority.
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Glossary / abbreviations and acronyms
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Index
A
AC voltage, 20
Access protection, 16
Address conversion, 164
Address parameters, 132
Administrator privileges, 38
Advanced mode, 108, 229
Approvals, 17
Approvals, see Standards, Approvals, 25
Authentication
User, 118
Authentication method, 179, 184
Autocrossover, 20
Autonegotiation, 20
B
Basic rules for firewall, 32
Broadcast, 180
C
Cable lengths, 25
CD, 19, 109
Certificate, 180
Check Consistency, 174
Local, 120
Project wide, 120
Commissioning, 31
Components of the product, 18
Configuration
Initial, 31
Loading, 31
Configuring offline, 31
Connectors, 24
C-PLUG, 16, 35
Empty, 36
Removing, 37
Reset, 37
C-PLUG slot, 36
D
Data espionage, 11, 14
Data manipulation, 11
DCP (Primary Setup Tool), 157
Dead peer detection (DPD), 190
Default Router, 133
Default setting, 22
Degree of protection, 17
DHCP
Symbolic names, 121
DHCP server, 131
Configuration, 172
DIN rail, 17, 27, 28
Displays, 23
Fault display, 23
Downloading, 124
E
Electrical data, 24
Encryption, 108, 117
Environmental conditions / EMC, 25
ESP protocol, 139
Ethernet cable
Crossover, 20
Exchangeable memory medium
C-PLUG, 16
External nodes, 14, 16
F
Factory defaults, 32
Fault LED (F), 23
Firewall, 12, 15, 135
Default, 138
Firewall rules, 130
Predefined rules, 136
Symbolic names, 121
Firewall for Ethernet non IP frames
according to IEEE 802.3, 130
Firewall rule sets
Global, 114
Firmware update, 38
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Index
G
Global firewall rules, 130, 142
Grounding, 31
Group, 180
Group assignments, 113
Group name, 149, 156
H
Hardware, 17
HTTPS (SSL), 139
I
ICMP services, 152
IEEE 802.3, 12
IKE, 139
IKE settings, 184, 185
Installation, 26, 27
Installation on a DIN rail, 28
Installation on a standard rail, 30
Types of installation, 27
Uninstalling, 29
Wall mounting, 30, 31
Internal nodes, 14, 16
IP firewall with stateful packet inspection, 130
IP packet filter rules, 146
IP rule sets, 142
IP services, 149
IPSec encryption, 12, 15
IPsec settings, 184, 186
IPsec tunnel, 12, 177
in routing mode, 133
Printed, 134
MAC packet filter rules, 153
MAC rule sets, 142
MAC Rules, 154
MAC services, 156
MD 740
Creating a configuration file, 126
Group certificate, 126
Module certificate, 126
MDI / MDIX autocrossover function, 20
Menu bar, 111
Menu commands, 111
Module
Creating, 131
Multicast, 180
N
NAT/NAPT, 164
NAT/NAPT router
Symbolic names, 121
NAT/NAPT router, 164
National Electrical Code,table 11 (b), 20
Network Address Port Translation, 167
Network Address Translation, 166
Network settings
of a module, 132
No repercussions, 12, 13, 15
Nodes
non-learnable, 195
Non IP frames, 179
NTP server, 159
L
O
Layer 2 frames, 12, 15
Learning capability, 15
Learning functionality, 12, 192
Learning mode, 192
Life of certificates, 182
Load distribution, 20
Local firewall rules, 130
Local PC clock, 159
Logging
Event classes, 227
Offline, 108
Online, 108
Order numbers, 26
Overview of the functions
Device types, 18
M
M32 screw cover, 36
MAC address, 31, 37, 133
P
Port status LEDs, 24
Ports, 125
Possible attachments, 19
Power LEDs (L1, L2), 24
Power supply, 17, 20
Preshared keys, 180
Project, 113
SCALANCE S and SOFTNET Security Client
256
Operating Instructions, 02/2011, C79000-G8976-C196-07
Index
Creating, 115
Initialization values, 115
Project data
Consistent, 108
Protocol-independent, 13
Purpose of the SOFTNET Security Client, 13
R
Replacement device, 37
Replacing a device, 37
Reset button, 22
Reset to factory settings, 22
RJ-45 jacks, 19
Router, 131
External, 134
NAT/NAPT router, 131
Standard, 134
Router mode, 15
Routing mode, 130
S
S7 standard rail, 31
SCALANCE S CD, 109
SCALANCE S Security Module, 11
Security Configuration Tool, 16, 107
Menu bar, 111
Modes, 108
Operating views, 108
Security settings, 201
Service group, 158
Service groups, 158
SiClock, 157
Signaling contact, 18, 21
SOFTNET Security Client, 11
Database, 204
Enable active learning, 213
Environment, 201
Load Configuration Data, 207
Startup behavior, 202
Uninstalling, 203
Software configuration limits, 25
SSL certificates, 161
Standard applications, 17
Standard mode, 108, 228
Standard rail, 27, 30
Standards, approvals, 25
ATEX 95, 27
EN 50021, 27
EN61000-4-5, 26
IEC950/EN60950/ VDE0805, 20
Stateful packet inspection, 12, 15
Status as supplied, 32
Subnet mask, 133
Symbol table, 121
Symbolic names, 121, 227
Syslog
Symbolic names, 121
T
Temperature range
Extended, 18
Terminal block, 18
Time stamp
of log entries, 159
TP Ports, 19
Tunnel, 177
Tunnel functionality, 177
U
User
Authorized, 108
Setting up, 118
User management, 113, 118
V
VLAN operation, 180
VLAN tagging, 180
VPN, 13, 177
Module-specific properties, 189
SOFTNET Security Client, 199
VPN tunnel, 12, 15
W
Wall mounting, 27, 30
Windows 2000, 109
Windows XP / SP1 or SP2, 109
SCALANCE S and SOFTNET Security Client
Operating Instructions, 02/2011, C79000-G8976-C196-07
257
Index
SCALANCE S and SOFTNET Security Client
258
Operating Instructions, 02/2011, C79000-G8976-C196-07
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