Network Connectivity
High-performance business VPN router with an integrated VDSL/ADSL2+
modem for secure multi-site networking
The LANCOM 1781VA is a professional, high-performance VPN router for high-speed Internet access with its
integrated VDSL2/ADSL2+ modem. With VDSL2-vectoring support it is ideal for high-speed VDSL connections
offering 100 Mbps for any industry and field of application—for site connectivity with maximum security and
performance. The right choice for secure, reliable and sustainable networking solutions "Made in Germany".
a Flexible business VPN routers for high-speed Internet access thanks to VDSL2/ADSL2+ modem
a Secure site connectivity with 5 simultaneous IPSec VPN connections (25 channels optional)
a Integrated stateful-inspection firewall with intrusion detection and Denial-of-Service protection
a Network virtualization with up to 16 networks on one device (ARF)
a Security Made in Germany
a Maximum future compatibility, reliability, and security
Professional VPN router with VDSL2 and ADSL2+
headquarters in Germany. Our in-house team of developers
works in a highly secure environment as certified by the BSI
Thanks to the integrated VDSL2/ADSL2+ modem and
(German Federal Office for Information Security), all of which
VDSL2-Vectoring, the LANCOM 1781VA supports high-speed
is subject to the highest standards of security, encryption,
VDSL with up to 100 Mbps and offers maximum versatility
and quality.
for you move from ADSL to VDSL. The smart choice for the
future viability of your network.
Maximum future-proofing
LANCOM products are based on professional expertise, years
Secure site connectivity via VPN
of experience in IT, and high-quality materials. All of our
The LANCOM 1781VA offers high levels of security. The
devices are equipped with hardware that is dimensioned for
standard equipment of 5 IPSec VPN channels guarantees
the future and, even reaching back to older product
strong encryption, secure connections for mobile employees,
and protection of corporate data. The LANCOM VPN option
System—LCOS—are available several times a year, free of
upgrades the router to support 25 VPN channels. This ensures
charge. This guarantees a long service life while staying
that your network is perfectly scalable and can grow on
technically up to date, which represents a true protection of
demand—without additional hardware components.
your investment.
Stateful inspection firewall
Equipped with a stateful inspection firewall, the LANCOM
1781VA protects the entire network. With features such as
intrusion prevention and Denial-of-Service protection, this
business VPN router provides optimal protection and secures
all of the data on the network.
Advanced Routing & Forwarding
The LANCOM 1781VA provides up to 16 securely isolated
IP contexts, each of which has its own separate routing. This
is an elegant way of operating IP applications with one
central router and keeping the different communication
channels securely separated from one another.
Security Made in Germany
In a market with a strong presence of American and Asian
products, LANCOM offers maximum security "Made in
Germany". The entire LANCOM core product range is
developed and manufactured in Germany, and tested
according to the highest standards of security, data
protection and quality. The company's own "closed-source"
operating system LCOS is developed at the company
LCOS 9.20
Layer 2 features
4.096 IDs based on IEEE 802.1q, dynamic assignment, Q-in-Q tagging
Layer 3 features
Stateful inspection firewall including paket filtering, extended port forwarding, N:N IP address mapping, paket tagging, user-defined
rules and notifications
Quality of Service
Traffic shaping, bandwidth reservation, DiffServ/TOS, packetsize control, layer-2-in-layer-3 tagging
Intrusion Prevention, IP spoofing, access control lists, Denial of Service protection, detailed settings for handling reassembly,
session-recovery, PING, stealth mode and AUTH port, URL blocker, password protection, programmable reset button
PPP authentication mechanisms
High availability / redundancy
VRRP (Virtual Router Redundancy Protocol), analog/GSM modem backup
IPv4-, IPv6-, NetBIOS/IP multiprotokoll router, IPv4/IPv6 dual stack
Router virtualization
ARF (Advanced Routing and Forwarding) up to separate processing of 16 contexts
IPv4 services
HTTP and HTTPS server for configuration by web interface, DNS client, DNS server, DNS relay, DNS proxy, dynamic DNS client, DHCP
client, DHCP relay and DHCP server including autodetection, NetBIOS/IP proxy, NTP client, SNTP server, policy-based routing
IPv6 services
DHCPv6 client, DHCPv6 server, DHCPv6 relay
IPv6 compatible LCOS applications
WEBconfig, HTTP, HTTPS, SSH, Telnet, DNS, TFTP, firewall, RAS dial-in
Dynamic routing protocol
RIPv2, BGPv4
IPv4 protocols
IPv6 protocols
NDP, stateless address autoconfiguration (SLAAC), stateful address autoconfiguration (DHCPv6), router advertisements, ICMPv6,
WAN operating mode
VDSL, ADSL1, ADSL2 or ADSL2+ additional with external DSL modem at an ETH port, UMTS/LTE
WAN protocols
PPPoE, Multi-PPPoE, ML-PPP, GRE, EoGRE, PPTP (PAC or PNS), L2TPv2 (LAC or LNS) and IPoE (using DHCP or no DHCP), RIP-1, RIP-2,
VLAN, IPv6 over PPP (IPv6 and IPv4/IPv6 dual stack session), IP(v6)oE (autokonfiguration, DHCPv6 or static)
Tunneling protocols (IPv4/IPv6)
6to4, 6in4, 6rd (static and over DHCP), Dual Stack Lite (IPv4-in-IPv6-Tunnel)
Intrusion Prevention
Monitoring and blocking of login attempts and port scans
IP spoofing
Source IP address check on all interfaces: only IP addresses belonging to the defined IP networks are allowed
Access control lists
Filtering of IP or MAC addresses and preset protocols for configuration access and LANCAPI
Denial of Service protection
Protection from fragmentation errors and SYN flooding
Detailed settings for handling reassembly, PING, stealth mode and AUTH port
URL blocker
Filtering of unwanted URLs based on DNS hitlists and wildcard filters. Extended functionality with Content Filter Option
Password protection
Password-protected configuration access can be set for each interface
Alerts via e-mail, SNMP traps and SYSLOG
Authentication mechanisms
PAP, CHAP, MS-CHAP and MS-CHAPv2 as PPP authentication mechanism
Anti-theft ISDN site verification over B or D channel (self-initiated call back and blocking)
Adjustable reset button
Adjustable reset button for 'ignore', 'boot-only' and 'reset-or-boot'
High availability / redundancy
VRRP (Virtual Router Redundancy Protocol) for backup in case of failure of a device or remote station.
For completely safe software upgrades thanks to two stored firmware versions, incl. test mode for firmware updates
ISDN backup
In case of failure of the main connection, a backup connection is established over ISDN. Automatic return to the main connection
LCOS 9.20
High availability / redundancy
Analog/GSM modem backup
Optional operation of an analog or GSM modem at the serial interface
Load balancing
Static and dynamic load balancing over up to 4 WAN connections (incl. client binding). Channel bundling with Multilink PPP (if supported
by network operator)
VPN redundancy
Backup of VPN connections across different hierarchy levels, e.g. in case of failure of a central VPN concentrator and re-routing to
multiple distributed remote sites. Any number of VPN remote sites can be defined (the tunnel limit applies only to active connections).
Up to 32 alternative remote stations, each with its own routing tag, can be defined per VPN connection. Automatic selection may be
sequential, or dependant on the last connection, or random (VPN load balancing)
Line monitoring
Line monitoring with LCP echo monitoring, dead-peer detection and up to 4 addresses for end-to-end monitoring with ICMP polling
IPSec over HTTPS
Enables IPsec VPN based on TCP (at port 443 like HTTPS) which can go through firewalls in networks where e. g. port 500 for IKE is
blocked. Suitable for client-to-site connections and site-to-site connections. IPSec over HTTPS is based on the NCP VPN Path Finder
Number of VPN tunnels
Max. number of concurrent active IPSec, PPTP (MPPE) and L2TPv2 tunnels: 5 (25 with VPN 25 Option). Unlimited configurable
connections. Configuration of all remote sites via one configuration entry when using the RAS user template or Proadaptive VPN.
Hardware accelerator
Integrated hardware accelerator for 3DES/AES encryption and decryption
Realtime clock
Integrated, buffered realtime clock to save the date and time during power failure. Assures timely validation of certificates in any case
Random number generator
Generates real random numbers in hardware, e. g. for improved key generation for certificates immediately after switching-on
1-Click-VPN Client assistant
One click function in LANconfig to create VPN client connections, incl. automatic profile creation for the LANCOM Advanced VPN Client
1-Click-VPN Site-to-Site
Creation of VPN connections between LANCOM routers via drag and drop in LANconfig
IPSec key exchange with Preshared Key or certificate (RSA signature, digital signature)
Smart Certificate*
Convenient generation of digital X.509 certificates via an own certifaction authority (SCEP-CA) on the webpage or via SCEP.
X.509 digital multi-level certificate support, compatible with Microsoft Server / Enterprise Server and OpenSSL. Secure Key Storage
protects a private key (PKCS#12) from theft.
Certificate rollout
Automatic creation, rollout and renewal of certificates via SCEP (Simple Certificate Enrollment Protocol) per certificate hierarchy
Certificate revocation lists (CRL)
CRL retrieval via HTTP per certificate hierarchy
OCSP Client
Check X.509 certifications by using OCSP (Online Certificate Status Protocol) in real time as an alternative to CRLs
XAUTH client for registering LANCOM routers and access points at XAUTH servers incl. IKE-config mode. XAUTH server enables clients
to register via XAUTH at LANCOM routers. Connection of the XAUTH server to RADIUS servers provides the central authentication of
VPN-access with user name and password. Authentication of VPN-client access via XAUTH and RADIUS connection additionally by
OTP token
RAS user template
Configuration of all VPN client connections in IKE ConfigMode via a single configuration entry
Proadaptive VPN
Automated configuration and dynamic creation of all necessary VPN and routing entries based on a default entry for site-to-site
connections. Propagation of dynamically learned routes via RIPv2 if required
3DES (168 bit), AES (128, 192 or 256 bit), Blowfish (128 bit), RSA (1024-4096 bit) and CAST (128 bit). OpenSSL implementation with
FIPS-140 certified algorithms. MD-5, SHA-1, SHA-256, SHA-384 or SHA-512 hashes
Hardware NAT
Wirespeed NAT performance through hardware support (offloading) for plain IP connections (incl. DHCP) where source and destination
addresses are not withn the same /20 network.
NAT-Traversal (NAT-T) support for VPN over routes without VPN passthrough
VPN data compression based on Deflate compression for higher IPSec throughput on low-bandwidth connections (must be supported
by remote endpoint)
Enables VPN connections from or to dynamic IP addresses. The IP address is communicated via ISDN B- or D-channel or with the ICMP
or UDP protocol in encrypted form. Dynamic dial-in for remote sites via connection template
Dynamic DNS
Enables the registration of IP addresses with a Dynamic DNS provider in the case that fixed IP addresses are not used for the VPN
LCOS 9.20
Specific DNS forwarding
DNS forwarding according to DNS domain, e.g. internal names are translated by proprietary DNS servers in the VPN. External names
are translated by Internet DNS servers
Coupling of IPv4 networks
IPv4 VPN over IPv6 WAN
Use of IPv4 VPN over IPv6 WAN connections
Coupling of IPv6 networks
IPv6 VPN over IPv4 WAN
Use of IPv6 VPN over IPv4 WAN connections
Radius authorization and accounting, outsourcing of VPN configurations in external RADIUS server in IKEv2
Only with VPN 25 option
VPN throughput (max., AES)
1418-byte frame size UDP
330 Mbps
Firewall throughput (max.)
1518-byte frame size UDP
800 Mbps
Hardware firewall throughput (max.)
930 Mbps
The SIP ALG (Application Layer Gateway) acts as a proxy for SIP communication. For SIP calls the ALG opens the necessary ports for
the corresponding media packets. Automatic address translation (STUN is no longer needed).
1 VDSL2 compliant with ITU G.993.2, profiles 8a, 8b, 8c, 8d, 12a, 12b, 17a
1 VDSL2 vectoring: Reduces crosstalk of cable bundles to increase the VDSL bandwidth
1 ADSL2+ over ISDN as per ITU G.992.5 Annex B/J with DPBO, ITU G.992.3/5 and ITU G.992.1 (EU, over ISDN)
1 ADSL2+ over POTS as per ITU G.992.5 Annex A/M with DPBO, ITU G.992.3 and ITU.G.992.1 (UK, over POTS / EU, over POTS)
1 Supports one virtual ATM circuit (VPI, VCI pair) at a time
WAN: Ethernet
10/100/1000 Mbps Gigabit Ethernet
Ethernet ports
4 individual 10/100/1000 Mbps Ethernet ports; up to 3 ports can be operated as additional WAN ports with load balancing. Ethernet
ports can be electrically disabled within LCOS configuration. The ports support energy saving according to IEEE 802.3az
Port configuration
Each Ethernet port can be freely configured (LAN, DMZ, WAN, monitor port, off). LAN ports can be operated as a switch or separately.
Additionally, external DSL modems or termination routers can be operated as a WAN port with load balancing and policy-based routing.
DMZ ports can be operated with their own IP address range without NAT
USB 2.0 host port
USB 2.0 hi-speed host port for connecting USB printers (USB print server), serial devices (COM port server), USB data storage (FAT file
system); bi-directional data exchange is possible
ISDN BRI port (S0 bus)
Serial interface
Serial configuration interface / COM port (8 pin Mini-DIN): 9,600 - 115,000 baud, suitable for optional connection of analog/GPRS
modems. Supports internal COM port server and allows for transparent asynchronous transmission of serial data via TCP
Management and monitoring
LANconfig, WEBconfig, WLAN controller, LANCOM Layer 2 management (emergency management)
Management functions
Alternative boot configuration, voluntary automatic updates for LCMS and LCOS, individual access and function rights up to 16
administrators, RADIUS and RADSEC user management, remote access (WAN or (W)LAN, access rights (read/write) adjustable seperately),
SSL, SSH, HTTPS, Telnet, TFTP, SNMP, HTTP, access rights via TACACS+, scripting, timed control of all parameters and actions through
cron job
Two stored firmware versions, incl. test mode for firmware updates
LANmonitor, WLANmonitor, LSM (LANCOM Large Scale Monitor)
Monitoring functions
Device SYSLOG, SNMPv1,v2c,3 incl. SNMP-TRAPS, extensive LOG and TRACE options, PING and TRACEROUTE for checking connections,
internal logging buffer for firewall events
LCOS 9.20
Management and monitoring
Monitoring statistics
Extensive Ethernet, IP and DNS statistics; SYSLOG error counter, accounting information exportable via LANmonitor and SYSLOG
ISDN remote maintenance
Remote maintenance over ISDN dial-in with calling-number check
Available for all LANCOM routers with integrated ISDN interface. LANCAPI provides CAPI 2.0 features for Microsoft Windows to utilize
ISDN channels over the IP network
CAPI Faxmodem
Softmodem for Microsoft Windows that makes use of LANCAPI to send and receive faxes via ISDN
iPerf is a tool for measurements of the bandwidth on IP networks (integrated client and server)
SLA-Monitor (ICMP)
Performance monitoring of connections
*) Note
Not for use with All-IP connection
1,1 lbs (500 g)
Power supply
12 V DC, external power adapter (230 V) with bayonet cap to protect against accidentally unplugging
Temperature range 0–40° C; humidity 0–95%; non-condensing
Robust synthetic housing, rear connectors, ready for wall mounting, Kensington lock; 210 x 45 x 140 mm (W x H x D)
None; fanless design without rotating parts, high MTBF
Power consumption (max)
14 Watts
Declarations of conformity*
EN 60950-1, EN 55022, EN 55024
IPv6 Ready Gold
*) Note
You will find all declarations of conformity in the products section of our website at
Scope of delivery
Hardware Quick Reference (EN, DE), Installation Guide (DE/EN)
Data medium with firmware, management software (LANconfig, LANmonitor, LANCAPI) and documentation
1 Ethernet cable, 3 m
VDSL/ADSL cable, 3m
ISDN cable, 3m
Power supply unit
External power adapter (230 V), NEST 12 V/1.5 A DC/S, coaxial power connector 2.1/5.5 mm bayonet, temperature range from -5 to
+45° C, LANCOM item no. 110723 (EU)/LANCOM item no 110829 (UK)
3 years support via hotline and Internet KnowledgeBase
Software updates
Regular free updates (LCOS operating system and LANCOM Management System) via Internet
LANCOM VPN-25 Option (25 channels), item no. 60083
LANCOM Content Filter
LANCOM Content Filter +10 user, 1 year subscription, item no. 61590
LANCOM Content Filter
LANCOM Content Filter +25 user, 1 year subscription, item no. 61591
LANCOM Content Filter
LANCOM Content Filter +100 user, 1 year subscription, item no. 61592
LANCOM Content Filter
LANCOM Content Filter +10 user, 3 year subscription, item no. 61593
LANCOM Content Filter
LANCOM Content Filter +25 user, 3 year subscription, item no. 61594
LANCOM Content Filter
LANCOM Content Filter +100 user, 3 year subscription, item no. 61595
LANCOM Warranty Basic Option S
Option to extend the manufacturer´s warranty from 3 to 5 years, item no. 10710
LANCOM Warranty Advanced Option S
Option to extend the manufacturer´s warranty from 3 to 5 years and replacement of a defective device on the next working day, item
no. 10715
LCOS 9.20
LANCOM Public Spot
Hotspot option for LANCOM access points and the LANCOM 17xx series for user authentication (up to 64), versatile access (via voucher,
e-mail, SMS), including a comfortable setup wizard, secure separation of guest access and internal network, item no. 60642
LANCOM All-IP Option
Upgrade option for the operation of the LANCOM 1781 series, 1631E, and 831A with All-IP connections, support of ISDN PBX systems
and telephony devices as well as ISDN voice & fax services, incl. Voice Call Manager, All-IP (TAE/RJ45) and cross-over adapters (TE/NT),
item no. 61422
Fax Gateway
LANCOM Fax Gateway Option activates 'hardfax' within the router. Supports 2 parallel fax channels with LANCAPI ('fax group 3'
without use of CAPI Faxmodem), item no. 61425
LANCOM Public Spot PMS Accounting Plus Extension of the LANCOM Public Spot (XL) Option for the connection to hotel billing systems with FIAS interface (such as Micros Fidelio)
for authentication and billing of guest accesses for 178x routers, WLCs, and current central-site gateways, item no. 61638
LANCOM WLC Basic Option for Routers
LANCOM WLC Basic Option for Routers for up to 6 managed LANCOM access points or WLAN routers, item no. 61639
LANCOM WLC AP Upgrade +6
LANCOM WLC AP Upgrade +6 Option, enables your WLC to manage 6 Access Points/WLAN router in addition, item no. 61629
LANCOM VoIP +10 Option
Upgrade for LANCOM VoIP router with 10 additional internal VoIP numbers (additionally up to 40), item no. 61423
LANCOM Large Scale Monitor
Powerful monitoring system for WLAN, VPN, and LAN infrastructures of mid-sized to large networks, upgradable for up to 1000
monitored devices, for a proactive error management, browser-based remote monitoring, intuitive user interface, graphic floorplans,
configurable triggers for alarms and messages, users, roles, and rights management
19" Rack Mount
19" Rackmount-Adapter, Art.-Nr. 61501
LANCOM Wall Mount
For simple, theft-proof mounting of LANCOM devices with plastic housings, item no. 61349
LANCOM Wall Mount (White)
For simple, theft-proof mounting of LANCOM devices with plastic housings, item no. 61345
LANCOM Serial Adapter Kit
For the connection of V.24 modems with AT command set and serial interface for the connection to the LANCOM COM interface, incl.
serial cable and connection plug, item no. 61500
VPN Client Software
LANCOM Advanced VPN Client for Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, single license, item no. 61600
VPN Client Software
LANCOM Advanced VPN Client for Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, 10 licenses, item no. 61601
VPN Client Software
LANCOM Advanced VPN Client for Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, 25 licenses, item no. 61602
VPN Client Software
LANCOM Advanced VPN Client for Mac OS X (10.5 Intel only, 10.6 or higher), single license, item no. 61606
VPN Client Software
LANCOM Advanced VPN Client for Mac OS X (10.5 Intel only, 10.6 or higher), 10 licenses, item no. 61607
Item number(s)
LANCOM 1781VA (EU, over ISDN)
LANCOM 1781VA (UK, over POTS)
LANCOM 1781VA (EU, over POTS)
LANCOM, LANCOM Systems and LCOS are registered trademarks. All other names or descriptions used may be trademarks or registered trademarks of their owners. Subject to change without notice. No liability for
technical errors and/or omissions. 07/16
LANCOM 1781VA (All-IP, EU, over ISDN)
LANCOM Systems GmbH I Adenauerstr. 20/B2 I 52146 Würselen I Deutschland I E-Mail
LCOS 9.20
Item number(s)