ADSL/VDSL modem operation (bridge mode)

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.

The configuration is conducted as follows:

1. Connect the LANCOM router, which is to operate as a modem, to the VDSL port.
2. Connect the main gateway to the LANCOM modem by means of an Ethernet cable.
3. Under Interfaces > LAN > Port table, assign the LAN interface and the xDSL interface to an unused bridge group.
4. Under Interfaces > WAN > Interface settings > xDSL modem operation, set the VDSL port to bridge mode. In the case of ADSL, you need to correct the ATM parameters (Deutsche Telekom: VPI 1, VCI 32, ATM mode LLC-Mux).
   
   
   
   
   
5. Deactivate the DHCP server under IPv4 > DHCPv4 > DHCP networks.
6. Give the router an intranet IP address from an unused range (for example, 192.168.3.254).
7. Set up the Internet connection on the main gateway using the setup wizard:
   1. Select your device in LANconfig and start the setup wizard "Set up Internet access".
      
      
      
      
      
   2. Follow the instructions in the setup wizard and select the option that best suits your needs. When you reach the step to set the "Interface for this connection", select the option Ethernet Interface (external modem/router).
      
      
      
      
      

If the LANCOM modem’s sync status is to be queried from the network, then go to Communication > Remote sites > Remote sites (DSL) and create a remote site named "Management" with a short hold time of "9999" seconds, layer name "IPOE", and DSL port "1".

In the IP parameter list under Communication > Protocols, select the remote site "Management" and give it an IP address from the unused range (e.g. 192.168.3.1/24). Now in the table IP router > Routing > IPv4 routing table add an entry 192.168.3.0/24 to the "Management" remote site with IP masquerading switched off. The modem can now be accessed and queried at the IP address 192.168.3.254.