IP WatchDog Lite
IP WatchDog Lite
Dual monitor of Ethernet devices with automatic reset function
EN 600 218
IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Shipment contents
Complete shipment of IP Watchdog Lite contains following items:
IP Watchdog Lite in a plastic case.
Two terminals for connection of external devices.
Power adaptor (European version).
Manual and datasheet.
CD containing necessary software.
Default network parameters configuration:
IP address: 192.168.1.60
Network mask : 255.255.255.0
Default gateway: 192.168.1.1
IP configuration via DHCP: Enabled
User name: Not set
Password: Not set
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IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Table of contents
Shipment contents ........................................................................................................................... 2
Default network parameters configuration: ................................................................................... 2
Table of contents.............................................................................................................................. 3
Characteristics and basic properties ............................................................................................. 4
Basic properties .............................................................................................................................. 4
Connection topology ....................................................................................................................... 5
Usage examples ............................................................................................................................. 5
Main WatchDog functions ............................................................................................................... 5
Technical parameters ...................................................................................................................... 6
Conectors and connection points .................................................................................................. 7
Connection and basic configuration .............................................................................................. 8
Device connection .......................................................................................................................... 8
Primary configuration of Ethernet parameters ................................................................................ 9
Configuration troubleshooting ....................................................................................................... 11
Device configuration via WWW ..................................................................................................... 12
IP WatchDogLite Main Page ......................................................................................................... 12
IP-WatchDog Lite Channel Admin Page ....................................................................................... 14
IP WatchDog Lite - Setup Page .................................................................................................... 16
IP WatchDog Lite – File Upload .................................................................................................... 18
IP WatchDog Lite – ConfigPage + Log ......................................................................................... 18
Description of configuration parameters ..................................................................................... 19
Device’s default configuration ....................................................................................................... 19
Device’s network parameters ....................................................................................................... 20
Securing by restricting the range of IP addresses ........................................................................ 20
Securing access to WWW interface administration ...................................................................... 21
Other device parameters .............................................................................................................. 22
Application hints ............................................................................................................................ 23
Security......................................................................................................................................... 23
Time protocol ................................................................................................................................ 23
NTP .............................................................................................................................................. 24
SNTP ............................................................................................................................................ 24
Using IP WatchDog in P2P networks............................................................................................ 24
Master Reset ................................................................................................................................ 24
Testing and operation hints for Windows and Linux .................................................................. 25
Testing the function of Incoming Ping ........................................................................................... 25
Mechanical dimensions ................................................................................................................. 27
Device versions .............................................................................................................................. 28
Contact ............................................................................................................................................ 28
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IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Characteristics and basic properties
IP WatchDog Lite is a device intended for monitoring Ethernet and
serial (RS232, RS485) devices provided by tracking the serial
communication, ICMP PING function. By the means of this function
it can RESET up to two monitored devices, such as servers,
routers, access points and other..
Basic properties
Ethernet - RJ45 (10BASE-T - IEEE 802.3).
Automatic reset or start of 2 devices in terms of monitored actions.
Methods for monitoring Ethernet devices:
o Incoming ping
o Outgoing ping
Two independent relays for resetting or starting monitored devices with two switching
contacts.
One relay contact is always non-potentional, the second is connected to a power supply.
Manual attendance (startup/shutdown/restart) of the monitored devices.
Time synchronization from internet / intranet using protocols :
o TIME – older but simple and popular protocol (UDP port 37).
o NTP/SNTP – most used time synchronization protocols (UDP port 123).
o DayTime – protocol that is not often used but which is implemented in Windows
(TCP/UDP port13).
Configuration methods:
o WWW page – device’s behaviour configuration including manual relay attendance.
o UDP Setup – configuration of main network parameters.
o TCP Setup – remote configuration of basic parameters in terminal over TCP.
Access security and relay control:
o It’s possible to define the range of IP addresses which will be allowed to communicate
with the device.
o Access to WWW pages can be restricted to certain user names and passwords.
o TCP setup can be secured by user name and password.
Power supply 9-15 V DC.
Plastic box dimensions: 35 x 101,5 x 76 [mm].
Master Reset – restoring the default configuration
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IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Connection topology
IP WatchDog Lite is intended for control and reset of the Ethernet devices. It’s equipped with the
functions such as sending and receiving ICMP command - PING on the defined IP address(es).
When monitoring by sending this command it is possible to enter up to two target IP addresses
(primary and secondary) so it could be possible to eliminate the inactivity of the whole device in
case one IP address is unavailable.
Usage examples
servers
routers
ADSL and cable modems
WIFI AP
Security and access systems
Accumulators
Main WatchDog functions
Monitoring Ethernet devices using incoming ICMP command - PING.
IP WatchDog Lite awaits incoming ping from the monitored device in preset intervals.
Monitoring Ethernet devices using outgoing ICMP command - PING.
IP WatchDog Lite sends in regular intervals a ping command to the defined IP address and
awaits a reply. It’s also possible to set a secondary IP, used in case the primary address is
engaged.
Reset of monitored devices or Starting backup systems in case of a dropout.
Manual attendance of both channels.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Technical parameters
Ethernet port
+ Interface
+ Compatibility
+ Supported protocols
RJ45 (10BASE-T / 100BASE-Tx)
Ethernet: version 2.0/IEEE 802.3
IP: ARP, TCP/IP, NVT, RFC2217, UDP/IP, TIME, NTP, SNTP, DAYTIME
Relay contact ampacity
DC voltage
AC voltage
max. 30V / 1A
max. 125V / 0,5A
Environment parameters
+ Operation temperature
+ Storage temperature
+ Relative humidity (noncondensing)
-5 to +50 °C
-5 to +75 °C
5 to 95 %
LED diods
+ POWER (green)
+ LINK (yellow)
+ Channel 1 (yellow)
+ Channel 2 (yellow)
Power supply on.
Ethernet interface active.
Channel 1 reset
Channel 2 reset
DIP switches
+ DIP1 - RS-232 Setup
+ DIP2 - Safe
ON = Service mode (for service purposes only)
OFF = Operational mode
ON = securing serial / TCP setup by user name and password (if configured).
OFF = without security
Monitored functions and parameters
+ Incoming Ping
+ Outgoing Ping
IP range – range of IP addresses defined by IP and mask, from which the receiving
PING can be accepted.
Timeout delay for reboot – time interval, in range from 0-1800 s ( 0 = disabled ), that
IP WatchDog waits for incoming PING before causing RESET.
Primary target IP – primary IP address where IP Watchdog sends the PING and from
which it awaits reply.
Secondary target IP – secondary IP address where IP Watchdog sends the PING
and from which it awaits reply, if primary target does not responds.
Quantity of failed ping for reboot – number of PINGs, that IP Watchdog assumes for
lost before causing RESET.
Outgoing ping interval – interval between sent PINGs in range of 0-1800 s ( 0 =
disabled).
Other parameters
+ Time synchronization
interval
+ Power supply
+ Dimensions
+ Mounting method
+ Weight
February 2006
1800 s
12-24 V/ min. 500 mA DC- coaxial power connector, GND on circuit.
35 x 101,5 x 76 [mm] (H x W x D ).
Separate box, “L” profiles or mounting to DIN molding.
450 g
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Conectors and connection points
Terminal block pins
Pin
Power
Function description
PO
Power ON
In the idle state this pin contains power supply of the IP Watchdog – axis of the power
connector
PF
Power OFF
In Reset mode this pin contains power supply of the IP Watchdog – axis of the power
connector
NC
NO
Normally Close
In Idle state this pin is connected with appropriate COM pin
Normally Open
In Reset state this pin is connected with appropriate COM pin
COM Common
Common pin
- in case of switching contacts (blue fields) connected to relay armature
- in power connectors (red fields) the second part of the power supply – casing of the
power connector
DIP switch description
ON = RS-232 SETUP mode
DIP1
OFF = Operation mode
SET
Master reset see page25!!!
DIP2 ON = TCP Setup mode security
SAFE OFF = Without security
LED description
Power
green
LINK
yellow
CH1,
CH2
yellow
Power on
Ethernet interface activity
Channel in RESET mode
February 2006
Other connectors
Coaxial connector for power supply of IP
WatchDog Lite or some monitored devices,
Power Power supply using a feeder of the monitored
device can be realized if it complies with the
maximum voltage for the IP Watchdog Lite
ON = Setup mode and WWW security
System
OFF= Without security
Switching the DIP1 during the first 5
seconds since power-on will cause Master
Reset, which restores all factory
configuration. All user’s settings,
including IP and passwords will be lost!
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IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Connection and basic configuration
In this chapter you will learn connecting the IP WatchDog Lite easily to your PC or company
network, setting it up the way it would satisfy your needs and putting it into service.
Device connection
The following procedure is recommended for quick setup of the device. Detailed description of all
parameters and commands can be found in the chapter called “Parameters description”.
Cable connection
Set switches from DIP1 to DIP2 into OFF position.
Connect IP WatchDog to the Ethernet 10 Mbit or 10/100 Mbit network. For direct connection
to the PC use a crossed TP cable, and for connection to hub/switch/router use classic TP
patch cable.
Connect the supplied power adaptor to supply network and plug the connector of the power
adaptor into the power connector of the IP relay. The Power LED indicator should light up.
If the Ethernet connection is OK, the LINK indicator should light up and then blink according
to the data transfer to the Ethernet (Activity signalization).
If there is a server in the DHCP network, the IP WatchDog requests the address from it
and it will be available immediately on this assigned IP address. In other case it will be,
after 60 seconds, available on the default IP 192.168.1.60
IP WatchDog Lite connection topology
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IP WatchDog Lite – Dual monitor of Ethernet devices
HW group
Primary configuration of Ethernet parameters
The primary configuration of the IP WatchDog Lite’s Ethernet parameters (IP address, network
mask and gateway) can be achieved by the following means:
UDP Setup – IP WatchDog Lite must be located on a local Ethernet network segment.
TCP Setup – only if you know the IP address of the device! TCP setup allows setting the
same parameters as Serial Setup. A bit complicated attendance allows changing the
parameters remotely via Ethernet / Internet, if the device is located on other network
segment.
UDP Setup – Searching the device using UDP setup
Launch the program by
„HerculesSetup.exe,“ which can be found
in the root directory of the supplied CD.
The latest version of the program can be
also downloaded for free from our web
pages - www.HWgroup.cz .
In the „UDP Setup“ tab, press the „Find
modules“ button (step 1). The device’s
MAC address should appear in the left
column.
Click on the MAC address (step 2). In the
field „Required parameters“ the configured
device parameters should appear.
See to it that the „Enable TCP Setup “field
is checked and by pressing „Set module“
(step 4) save the parameters.
Note: If you wish to change these basic parameters (it’s necessary to set at least the IP address,
port, mask and gateway), enter the desired parameters into proper fields and press the „Set
module” button (step 4). When entering IP address and Gateway manually, it is also necessary to
disable assigning DHCP by the server (clear Enable DHCP field)
Enter the IP address of the device into your WWW browser
and press Enter. You will get a Main Page of the www
interface.
Detailed information on configuration methods over www
interface can be found in the chapter called Device
configuration via WWW.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Connection to IP WatchDog using terminal and TCP Setup
Go to the „TCP Client“ tab.
Enter the preset IP address to the „Module IP“
field (step 1).
Into the „Port“ field enter „99“ (step 2), no
matter which port you have set for
communication with the device. (Port 99 is
reserved for TCP setup).
Press the „Connect“ button (step 3).
The prompt „WEB51>“ will appear in „Received
/ Sent data“ window. Click into this field and
press Enter. The window will be filled with
actual parameter configuration.
Specific parameters can be set by choosing the
letter of the corresponding option and proper
value (example: „I192.168.6.8“ for configuration
of device’s IP address).
Note: Complete list of parameters and commands with detailed descriptions can be found in
chapter “Description of configuration parameters”.
Help for the commands is available through sending command in format “command?” and pressing
Enter. Example: “I?” + Enter.
When configuration is done, you must restart the device with the “R” command. Disconnect by
pressing the “Close” button.
Serial Setup can be closed temporarily by “x” command. Don’t forget to switch DIP1 back to the
OFF position when you finished your work, or IP WatchDog will not be able to communicate via
Ethernet.
Configuration of basic network parameters using a terminal program
For primary launch the IP WatchDog Lite needs to have configured only several main Ethernet
parameters – the IP address, network mask and gateway which can be found in the IP Setup
section.
WatchDog’s IP address
I: IP address
Entry example: I192.168.1.4
192.168.1.60
Network mask
M: Mask
Entry example: M255.255.255.0
255.255.255.0
Default gateway
G: Gateway
Entry example: G192.168.1.250
192.168.1.1
Note: Serial Setup allows setting lots of other parameters. These, though, are more easily
configurable via Ethernet using the Hercules Setup Utility or via WWW interface. Detailed
description of configuration parameters of the terminal Setup can be found in chapter “Description
of configuration parameters”.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Configuration troubleshooting
The MAC address of the device did not appear in the “Modules MAC list” or the device does
not communicate over Ethernet.
Check the power adaptor’s connection (the Power indicator of the device must be lit).
Your Ethernet network must support 10 Mbit devices.
Check whether you are using a correct TP cable (TP Patch cable for connection to a
hub/switch/router; crossed TP cable for direct connection to a PC).
Check configuration of DIP switches of the device (all should be in OFF position).
If you are using firewall, make sure it does not block communication with the device.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Device configuration via WWW
IP WatchDog Lite contains a WWW interface allowing easy and detailed attendance of the device
activity. The interface consists of four HTML pages which can be called by entering IP address of
the device from your web browser.
IP WatchDogLite Main Page
After entering WatchDog Lite’s IP address to the web browser you will get a main page showing the
basic parameters of WatchDog Lite’s channels and statistics for the last 20 operations of each
channel. In the upper part of the screen you can see links for advanced properties configuration of
the IP WatchDog Lite:
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Displayed data
Refresh page stop (Refresh page for): - Interval of the Main Page refresh (see Setup
Page).
Refresh now – Immediately refreshes the Main Page. Because of used scripts it’s not
possible to use browser’s Refresh (F5).
Device name – name of the monitored device (see Channel Admin Page).
Channel – information on closing or opening of the channel (Enable / Disable).
Monitoring method – actual function assigned to the channel (see Channel Admin Page):
o Incoming Ping – IP WatchDog Lite waits for ICMP command – PING Request from
the defined address or range of addresses defined by IP and mask.
o Outgoing Ping – IP WatchDog Lite sends the ICMP command PING Request to the
defined primary IP address and awaits response. If not received, the same command is
sent to the secondary IP.
Monitoring period – maximal interval between resetting impulses (see Channel Admin
Page).
Reboot Hold Time – the length of a reboot impulse (see Channel Admin Page)
Channel state – information on actual channel :
o Channel Inactive - channel is deactivated. Allows manual relay attendance using
Channel Admin Page.
o Device Checking – Channel waits for refreshing impulse.
o Device Idle – Channel was reset. Awaiting first refreshing impulse.
o Power Cycle Reboot - Performing channel reset.
o Manual WWW reboot – Channel was reset manually.
Manual Reboot – Resetting button.
Last 20 Actions – last 20 stored actions:
o --- IP-WatchDog: startup --- starting IP WatchDog
o First synchronizations of time – synchronization by NTP/Time/DayTime server.
o Ready – after Watchdog’s turning on/reset the channel is ready
o Shutdown – channel shutdown.
o Run – channel start.
o Automatic reboot – automatic Reset.
o Manual reboot: from website – manual reset from WWW page.
o Reset by response to outg. ping – received the response for outgoing PING.
o Reset by response to inc. ping – received an incoming PING.
o >>>> Event 5 <<<< - The period preventive reset of the device has been executed
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IP WatchDog Lite – Dual monitor of Ethernet devices
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IP-WatchDog Lite Channel Admin Page
HTML pages IP-WatchDog Lite Channel 1 Admin Page and IP-WatchDog Lite Channel 2 Admin
Page allow complete administration of the monitored channels.
Channel 1 Setup
Device name – Makes orientation easier when configuring channels and solving the
problems with the monitored device. It can contain at most 20 characters.
Reboot Hold Time – duration of the Reset state. Allows setting time when the channel/relay
stays in reset state (manual or automatic). Duration can be set from interval 1-1800 seconds.
If this parameter is set to “0” then the Reset state lasts until the next refreshing impulse
comes. This mode is suitable for activation of the backup device or identification of the error
state using other signalization means. More information can be found in the Reboot Hold
Time paragraph of the chapter “Application hints”.
Timeout After Reboot – time interval that IP WatchDog Lite waits before causing other
Reset after previous one (or after first launch of the device), if monitored data are not
received. The Interval can be from range of 0-1800 seconds. The “0” value causes device to
wait for first incoming data from the monitored device.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Channel enabled/disabled – enables/disables a channel. If the channel is deactivated, the
additional Manual Control button will be available above the Save values button:
o ManualControl : Inititial State – indicates a default channel state (or relay). Pressing
the button changes the state to reset state.
o ManualControl : Reboot State – indicates channel state (or relay) in reset level.
Pressing this button changes the state to idle state.
Reset by Ping – Incoming Ping
IP range – range of IP addresses given by IP address and network mask, which PING will
be accepted from.
Timeout for reboot – interval, that IP WatchDog Lite waits for incoming PING from the
monitored device before causing Reset. This interval can be from the range of 0-1800
seconds, where 0 means disabling the function.
Reset by Ping – Outgoing Ping
Primary target IP – IP address of the target device.
Secondary target IP – secondary IP address of the target device. In case of monitoring a
single device (IP), both primary and secondary address will be the same.
Pinging Timeout– interval between individual sent pings from the range of 0-1800 seconds.
“0” value = function disabled.
Failed pings per timeout for reboot– Number of allowed sent PINGs without response from
the IP WatchDog Lite during a Pinging Timeout interval
Note: Interval between the individual pings (attempts) = Pinging Timeout / Failed pings per
timeout for reboot. => Which implies :
Minimal interval between possible resets = Pinging Timeout
Maximal number of the invalid pings allowed = Failed pings per timeout for reboot
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IP WatchDog Lite – Dual monitor of Ethernet devices
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IP WatchDog Lite - Setup Page
IP WatchDog Lite Setup Page contains two groups of configuration parameters: Global and Time
and Date.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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IP WatchDog Global
Current Network settings – Actual device’s network parameter configuration. If the DHCP
server is allowed to assign them (DHCP enabled), the gained values are then damped.
o IP address – actual device’s IP address
o Mask – actual network mask
o Gateway – actual Gateway
o DHCP enabled/disabled – information whether assigning of the network parameters
by DHCP server is enabled
Main Page Refresh time – Main Page refresh rate.
Time and Date
Time – shows actual time in HH:MM:SS format that can be set in IP WatchDog Lite.
Date – shows actual date in DD/MM/YYYY format that can be set in IP WatchDog Lite.
Time server IP address – server IP address, which IP WatchDog Lite will be synchronized
with.
Time server protocol - protocol for time synchronization. If the server is not located within
internal network, proper router or firewall communication ports must be also enabled for this
server.
o NTP – most common time synchronization protocols (UDP port 123). Requires filling
of the following IP-WatchDog fields: time zone and Time server: time zone.
o Time – older but easy protocol (UDP port 37).
o DayTime – not very common protocol that is implemented in Windows (TCP/UDP
port13).
IP-WatchDog: time zone – time zone according to GMT in the +/- HH:MM:SS format, where
IP WatchDog is located.
Refresh Time now – button for immediate time synchronization. IP WatchDog Lite tries for
the synchronization up to 5 times.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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IP WatchDog Lite – File Upload
IP WatchDog – File upload is a page for easy firmware update over www interface. Consists of two
lines and two buttons:
Current version – displays actual firmware version
Browse – allows easy search for the proper HWG firmware file.
Upload – performs upload of the firmware to IP WatchDog Lite
Note:
o When firmware is uploaded the IP WatchDog Lite will be automatically rebooted.
o Page is accessible ONLY via IP-WatchDog Lite Setup Page
IP WatchDog Lite – ConfigPage + Log
ConfigPage – Allows creating a backup
and later restoring the complete IP WatchDog’s configuration.
Note: Not available for Firmware versions 1.9.8 and previous!
Log – Makes the log of events available in XML format.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Description of configuration parameters
In the following chapter you will find a detailed description of all configuration parameters used for
device settings, which can be realized by serial or TCP terminal. Information on connection to TCP
Setup can be found in the chapter „Quick Setup“.
Device’s default configuration
Bellow you can find the list of standard configuration of any supplied IP WatchDog Lite. The default
configuration can be set anytime by choosing option “D0” or “D1” from Setup. Description of device
configuration and command entering can be found in chapter “Quick Setup”.
============================================================
*** IP-WatchDog - version 1.9.8 - Jul 2 2006 20:26:29 ***
============================================================
ActualTime: 18:53:26 ActualDate: 26/7/2006
Time is synchronized with: NTP Server[192.43.244.18]
============================================================
MAC Address
00:0A:59:01:E0:03
========== IP Setup ========================================
I: IP address
192.168.1.60
M: Mask
255.255.255.0
G: Gateway
192.168.1.1
B: DHCP configuration
OFF
========== In IP access WEB filter =========================
W: IP address
0.0.0.0
N: Mask
0.0.0.0
========== Security Setup ==================================
%S: Remote setup
UDP & TCP(Port:99)
@R: Periodic Reboot 1440
========== WebPage-Security Setup ==========================
$N: Authorization username (not set)
$P: Authorization password *******
========== Other ===========================================
D: Load Settings from EEPROM
R: Reboot
X: Exit
L: XML log
WatchDog>
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Device’s network parameters
I=========== IP Setup ======================
IP address of IP WatchDog Lite
I: IP address
Entry example: I192.168.6.4
Sets IP WatchDog’s IP address.
192.168.1.60
MASK, IP address and Gateway
description:
Ethernet device communicates:
Within local Ethernet. You don’t
need a Gateway, but IP addresses of
both devices must be in the range
allowed by the Mask setting. If you
set the Mask to 255.255.255.0 it
means that IP addresses may differ
only in the last byte of the IP address.
Network Mask
M: Mask
255.255.255.0
Entry example: M255.255.255.0
Configuration of local network IP mask. The IP relay will
communicate via Gateway with all IP addresses except
those defined by Mask and own IP address.
Outside the local network – via
Gateway, which is located in the
range or IP addresses allowed by the
mask.
Default Gateway
G: Gateway
192.168.1.1
Entry example: G192.168.6.1
Gateway address, which grants device an access to
external networks. Except for the IP addresses defined
by configured IP address and Mask.
You can also restrict the range of IP
addresses that the device will not
communicate with. This can be set using
„In IP Setup“. For debugging purposes
we recommend keeping this parameter at
0.0.0.0.
Enabling automatic configuration by DHCP server
B: DHCP configuration
OFF
Possible options: 0 / 1 (0 – disabled, 1 - enabled)
Entry example: B1
DHCP server allows automatic device configuration without need of any user’s actions. IP address,
network mask and default gateway parameters can be assigned. Because DHCP assigns IP
address that is available at the moment, it does not have to be always the same.
Securing by restricting the range of IP addresses
====== In IP access filter ======
IP address for remote configuration
W: IP address
0.0.0.0
Entry example: W192.168.6.1
IP address of the network or computer, which can establish the connection with the device. After bit
multiplication of the opposite IP address by restrictive Mask (N option) you can gain the address
mentioned here. Otherwise the device will not react.
Mask for remote configuration
N: Mask
0.0.0.0
Entry example: N192.168.6.1
Mask restricting access addresses, which can establish communication with the device. With the
help of this mask you have a higher chance to prevent a security break or avoid unwanted
communication with unauthorized device.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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====== Security Setup ===================
Allowing remote configuration via TCP/IP or UDP/IP
%S: Remote setup
UDP & TCP
Possible options: 0 / 1 / 2 / 3 (0 – disabled, 1 – UDP, 2 – TCP, 0 – UDP & TCP)
Entry example: %S1
Allowing TCP/IP setup at port 99.
WARNING: Choosing the D0 option, you will irreversibly disable the remote access to
network parameters’ configuration.
Configuring the preventive periodic auto-restart or the IP WatchDog
@R: Periodic Reboot 1440
Example: @R60
The number represents the amount of minutes between individual restart. It’s an internal matter that
raises the IP WatchDog’s reliability in highly exposed networks (P2P networks etc.) Monitored
devices WILL NOT be restarted.
Securing access to WWW interface administration
========= WebPage-Security Setup ========
User name
$N: Administrator username
(not set)
Entry example: $Nname
User name that will be required on access to the Channel Admin Page and SetupPage or when
accessing serial / TCP setup (if DIP3 is closed).
Password
$P: Administrator password
(not set)
Entry example: $Ppassword
Password that is required when accessing the Channel Admin Page and SetupPage or accessing
the serial / TCP setup (if DIP3 is closed).
Note : Securing by user name and password can be deactivated by inputting empty user name and
password.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Other device parameters
=========== Other =====================
Loading the default configuration
D: Load Settings from EEPROM
Possible options: 0 / 1 (0 – Load from EEPROM, 1 – Saving actual configuration into EEPROM).
Entry example: D0
Allows saving WatchDog’s parameters for later reload in case of necessary return to former
configuration.
Device Restart
R: Reboot
Entry example: R
Software restart of the IP relay. Necessary e.g. for changing the IP address etc.
Leaving the Setup mode
X: Exit
Entry example: x
Allows to exit the Setup temporarily and to run the IP WatchDog Lite in the operational mode even
at closed DIP1. If the DIP1 is closed at next WatchDog Lite’s startup as well, the device will already
enter the Setup mode.
XML log
L: XML log
Example: L
Makes the system log available through an XML format.
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Application hints
Security
Access to the configuration WWW page - Channel Admin Page and Setup Page can be also
restricted by user name and password, which can be defined in the serial / TCP Setup. If user name
of password has been set, it is required for every access to these pages and for every manual reset
using the Manual Reboot button of the Main Page. This precaution can be deactivated by sending
an empty user name and password (default state).
Advanced security provides DIP3, which, if activated, requires user name and password
authorization even for access to serial / TCP Setup. When DIP3 is closed the UDP Setup is
deactivated, because it would allow changing the network parameters easily, even for beginner.
Reboot Hold Time
Besides the classic reset of the monitored device and its following release, the IP WatchDog Lite
allows also the possibility of permanent Reset state in case the monitored device does not respond
to the WatchDog Lite’s requests or does not send regular refresh impulses. This mode can be
activated by setting the Reboot Hold Time parameter to “0”. If the RESET state is called in this
mode, the channel (or its output) remains in this state until the monitored device reports itself again
or the channel is deactivated.
The function is suitable for cases when IP WatchDog Lite does not reset directly monitored device
or when one of the channels serves for activation of the backup device or other alarm system.
Note: If the value of the Reboot Hold Time = 0, the WatchDog Lite enters the Permanent Reboot
Hold Time mode where the Reset function and especially Manual Reset behave the different way
than in the standard mode that were described above. This Reset state can’t be ended by itself.
Especially using Manual Reset with deactivated channel when there is no way to end the Reset
state and only possibility is to activate the channel and initialize the refresh impulse.
Time protocol
The Time protocol consists in the server listening on the port 37 and after establishing connection it
(using the TCP or UDP protocol) sends user a 32bit number with a mark (in a binary supplement format).
The number represents the number of seconds since 00:00:00 of the January 1, 1900 GMT. The number
2.398.291.200 therefore corresponds to 00:00:00 of the January 1, 1976 GMT and number 1.297.728.000 corresponds to 00:00:00 of the November 17, 1858 GMT. If the server does not support
this function the connection will be either refused or closed immediately. The time synchronization
accuracy using this protocol is not very high and lies around 1 second. Detailed description of the Time
protocol can be found in RFC-868 document.
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NTP
Network Time Protocol (port 123 UDP, for tracing it’s also TCP), which also uses 64bit time mark in the
number format with fixed base point, is much more sophisticated than Time protocol and more accurate
as well. It’s intended for permanent time synchronization of more computers on network. The NTP
protocol is based on the fact, it doesn’t try to synchronize the computer times mutually (that means it
does not “average out” the times), but the time is synchronized in comparison with the UTC time
("Universal Time Coordinated").
The synchronized servers are thus placed into hierarchical multi-level tree structure. Thanks to this the
load can be poised and the NTP service can be distributed according to the user’s needs. In the top layer
there are main time devices (atomic clock, GPS, clock set by a time signal, etc.) Each server is in a
specific layer (stratum), while the first layer (stratum-1) represents the server that is connected to some
external time device (stratum-0). Its “descendants” (e.g. in second, third or fourth layer) are assumed to
be less accurate.
The synchronization accuracy lays in tenths of milliseconds. The main transfer protocol UDP. The NTP
protocol description can be found in the RFC-1305 document.
SNTP
The SNTP (Simple Network Time Protocol) is based on the NTP (Network Time Protocol) and for
communication it uses port 123 as well. Main difference makes the client, which only supports SNTP,
cannot serve as a server for other clients, allows time synchronization by one server only and has lower
synchronization accuracy. The synchronization accuracy of this protocol lays from units to tenths of
milliseconds which is sufficient for common usage. Detailed description of the SNTP protocol can be
found in the RFC-2030 document.
Using IP WatchDog in P2P networks
In case you use the IP WatchDog in the environment of the Peer-to-Peer networks, such as DC++,
Kazz, Bittorent etc, there might occur flooding of the IP WatchDog’s network interface, caused by a
large amount of residual packets which can cause the false restarts of the monitored devices. Then
it is recommended to lower the @R parameter in TCP Setup to circa 60 (according to the monitoring
period). The value gives the number of minutes between individual restart of the IP WatchDog.
Monitored devices WILL NOT be restarted.
Master Reset
In case the TCP Setup or WWW becomes blocked by either wrong configuration or erroneous
Firmware upload, the Master Reset can be executed. This will restore the default factory
configuration.
Warning : Executing Master Reset will cause that all the user’s settings including IP and
passwords will be lost!
Procedure of the Master Reset:
Disconnect the power from the IP WatchDog Lite
Turn the power on.
During first 5 seconds since power-on change the DIP1 position to the second position and
then back again.
Wait for circa 30 seconds. The IP WatchDog Lite default configuration will be restored.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Testing and operation hints for Windows and Linux
Testing the function of Incoming Ping
Testing command of the Incoming Ping function for Windows
Application of the ICMP PING function in
Windows is very simple but can be even
little tricky. Main ping testing can be
managed via Windows command line
(START menu -> Run -> enter “cmd” and
press OK). Command line application will
appear (in older Windows versions it is MSDOS window). In that just enter the
command in following format:
ping ip_adresa_watchdogu, například ping 192.168.5.60
You will get similar screen like this:
Microsoft Windows XP [Verze 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Vít Olmr>ping 192.168.5.60
Příkaz PING na 192.168.5.60 s délkou 32 bajtů:
Odpověď od 192.168.5.60: bajty=32 čas=1ms TTL=64
Odpověď od 192.168.5.60: bajty=32 čas < 1ms TTL=64
Odpověď od 192.168.5.60: bajty=32 čas=1ms TTL=64
Odpověď od 192.168.5.60: bajty=32 čas < 1ms TTL=64
Statistika ping pro 192.168.5.60:
Pakety: Odeslané = 4, Přijaté = 4, Ztracené = 0 (ztráta 0%),
Přibližná doba do přijetí odezvy v milisekundách:
Minimum = 0ms, Maximum = 1ms, Průměr = 0ms
If you wish to send the PING permanently, enter the command with the –t parameter: :
ping 192.168.5.60 –t
Command line can be also launched using the standard windows shortcuts, that can be located in the
program menu:
Windows 98: Start | Programs | MS-DOS Prompt
Windows NT: Start | Programs | Command Prompt
Windows ME: Start | Programs | Accessories | MS-DOS Prompt
Windows 2000: Start | Programs | Accessories | Command Prompt
Problems in using PING under Windows can appear when using Firewall or have Windows XP with SP2
(service pack), that already contains a simple firewall. So if you are unable to use PING to the Watchdog
or from it, check that the firewall configuration does not block ICMP commands echo reply and echo
request (if it does, unblock them) or use other method (like WWW page). Some servers themselves
block the PING commands to prevent overloading and “pinging to death” (so called Ping of Death
attack).
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Test command for Incoming Ping under Linux/Unix
Using PING command under Unix and Linux OS is as simple as in the case of Windows, maybe even
easier because you don’t have to run the command line. Just enter the following into the console:
ping 192.168.5.60
Operational command of the function Incoming Ping under Windows
Windows provide a free service for Windows Server 2000/2003 and Windows 2000/XP, that can be
downloaded from
http://www.hw-group.com/download/IPWDT_Setup_1.0.zip
allowing sending ping to the defined address in regular intervals. The form of services is applied to allow
running it automatically even on server systems without a need of logging in. After Unpacking and
installation it is necessary to modify a configuration file IPWDT.ini, that can be located at C:\Program
Files\HW group\IPWD Tools .
It contains following:
[PING]
IP=192.168.1.9
INTERVAL=10
DEBUG=2
Interval is measured in seconds, Debug parameter defines
whether the communication will be logged in the directory
C:\Program Files\HW group\IPWD Tools (max. file size is
5MB).
An icon for IP WatchDog Tools Control created in Control
panel allows activation and deactivation of the services
Operational command for Incoming Ping under Linux/Unix
In Unix systems it is used so called demon cron, that executes commands according to the crontab,
that is a simple text document that contains data in a tab in following format:
1
*/1
2
*
3
*
4
*
5
*
6
user’s account
7
command
Where :
1. minute
2. hour
3. day of a month
4. month
5. day of a week (0 - Sunday, 1 - Monday... 6 - Saturday)
6. user’s account
7. path to the program or command that should be executed
This tab can be edited easily using a command crontab –e, that opens the specific document. The
created entry can look like this :
*/1
*
*
*
*
root
ping 192.168.5.60
This command will execute the ping every minute.
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Mechanical dimensions
Description of the variations that can be ordered can be found at the end of this manual.
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IP WatchDog Lite – Dual monitor of Ethernet devices
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Device versions
IP WatchDog Lite can be supplied in several versions differing in accessories.
Ordering Nr.
Product name
Device version
600 218
IP WatchDog Lite
600 223
IP WatchDog Lite for AP/Router
600 225
IP WatchDog Lite for Power switch
Complete package of IP Watchdog Lite, with power source,
2x dual terminal board and CD with software and manual.
IP WatchDog LIte with reduction of Terminal board for
switching power supply by power connector (600 221)
IP WatchDog Lite with two bipolar relay for DIN molding with
LED signalization.
Optional accessories and related products
Ordering Nr.
Product name
Description
600 219
2-pin Terminal Block
600 220
Terminal Block / Power Connector
900 221
Terminal Block / 2x Power connector
600 025
DIN Rail box set
Spare double terminal board
Reduction from terminal block to power connector
Reduction for switching external power supply witch
power connector.
Including instalation on the box
600 084
Unipolar 12V relay with switching contact on the DIN
DIN Rail Relay - 1x switch contact 10
molding, allowing closing the voltage directly up to
A
250V/10A.
600 085
Unipolar 12V relay with switching contact on the DIN
DIN Rail Relay - 2x switch contact 10
molding, allowing closing the voltage directly up to
A
250V/10A.
600 220 – 2-pin Terminal Block
600 220 – Terminal Block / Power conn.
600 221 – Terminal Block / 2x Power
conn.
600 085 – Bipolar relay for DIN
molding with LED
600 084 – Unipolar relay for DIN
molding
600 220 – Terminal Block / Power conn.
Contact
HW group or HW server
Rumunska 26 / 122
Prague 2
120 00
Tel. +420 222 511 918
Fax. +420 222 513 833
–
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IP WatchDog Lite – Dual monitor of Ethernet devices
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http://www.HWgroup.cz/
February 2006
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