LANCOM Support Knowledgebase
Document No. 1807.0409.1952.RHOO - V2.20
LCOS as of version 10.20: Using a LANCOM VDSL router as a modem
With the ongoing migration of ISDN connections to All-IP, the ISDN connections available at sites are being converted into additional DSL connections. In order to provide this new bandwidth to the whole of the network, the router needs to be connected to the new DSL line.
If the DSL connection of the gateway is already in use, a LANCOM VDSL router can be connected upstream as a pure DSL modem. The access and VoIP data continue to be stored in the main gateway. This allows additional DSL connections to be transparently integrated into the existing scenario.
As of LCOS Version 10.20, all LANCOM VDSL routers can be switched to DSL Bridge mode.
This allows the use of the devices as a pure DSL modem.
The Bridge mode refers only to the internal xDSL modems.
If the router (additionally) has a built-in LTE modem, the
LTE modem can not be operated in bridge mode!
LCOS as of version 10.20 (
LANtools as of version 10.20 (
LANCOM VDSL router (e.g. LANCOM 730VA)
Configuration steps on the router used as a modem
Connect the LANCOM router, which is to operate as a modem, to the VDSL port.
Connect the main gateway to the LANCOM modem by means of an Ethernet cable.
In the menu
Interfaces -> LAN -> Port table
, combine the LAN used and the xDSL interface in a free bridge group.
In this example, the
logical interface LAN-1 and the interface XDSL-1 are combined
unused bridge group BRG-2
Switch to the menu
Interface -> WAN -> Interface Settings -> xDSL modem operation
and configure the VDSL port to Bridge Mode.
operation on VDSL connections
no further parameter needs to be changed.
(for example, Deutsche Telekom), you must configure the ATM parameters to the following values:
Deactivate the DHCP server
of the device in the menu
IPv4 -> DHCPv4 -> DHCP networks
IPv4 -> General -> IP networks
menu, assign a
local IP address from an unused IP address range
(for example, 192.168.3.254/24).
1.7 make sure that in the
Menu Interfaces -> LAN -> LAN bridge settings
option Connect using a bridge is activated.
1.8 Write the configuration back to the device.
Set up the Internet connection on the main gateway
In this example, the main gateway is a LANCOM 1781EF +. Since this device does not have a built-in VDSL modem, dial-up to the Internet should be carried out via the LANCOM 730VA, which was configured as VDSL modem in step 1.
setup wizard in LANconfig
and select the option
Set up Internet access
In this example, a
new IPv4 connection
is to be created.
Ethernet interface (External Modem / Router)
setting to use an external modem.
In this example, the
external VDSL modem is connected to the WAN port of the LANCOM router
must be selected as the
in the following dialog.
Internet service provider
in the following dialog.
In the next dialog you have to
select your product
In the following dialog, enter the
access data that you received from your provider
VLAN tag that your provider uses
. For Deutsche Telekom VDSL connections the VLAN-ID is 7.
In this example,
no backup connection
Quit the setup wizard to set up the Internet connection with the
The configured values are then written to the LANCOM router.
After the configuration has been written back to the device, the setup wizard asks if you want to continue with another wizard.
in this dialog because the configuration steps to set up the VDSL connection are complete.
Make sync status of the LANCOM modem accessible from the network (optional)
If the sync status of the LANCOM modem shall be accessible from the network, you must
add a new remote site called Management
in the menü
Communication -> Remote sites -> Remote sites (DSL)
hold short of 9999 seconds
layer name IPOE
DSL port 1
Then switch to the menu
Communication -> Protocols -> IP Parameters
create an entry
with the following values:
an IP address from the IP address range configured in step 1.6 (e.g. 192.168.3.1)
The netmask of the unused IP address range configured in step 1.6 (here 255.255.255.0).
IP Router -> Routing -> IPv4 routing table
create an entry for the network 192.168.3.0/24
points to the remote site Management
and in which
IP masking is deactivated
Write the configuration back to the device.
The LANCOM modem can now be
reached and read out via the IP address 192.168.3.254.
The sync status of the xDSL router is also indicated by the xDSL-LED. When using the Bridge-Mode only the sync status is displayed. During active DSL sync the LED shines green permanently.
Catchwords: dsl; bridge; modem; vdsl
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