1) Configuration steps on the router used as a modem (Modem router):
1.1) Connect the LANCOM router, which is to operate as a modem, to the VDSL port.
1.2) Open the configuration of the Modem router in LANconfig and go to the menu Interfaces → LAN → Ethernet ports.
Image Modified 1.3) Edit the Ethernet port to be used for administration of the router (in this example ETH 1) and make sure that the logical interface LAN-1 is assigned to it.
Image Modified 1.4) Edit an unused Ethernet port to be used for the connection to the gateway router (in this example ETH 4) and select the interface LAN-2 as Interface usage.
Image Modified 1.5) Go to the menu Interfaces → LAN → LAN bridge.
Image Modified 1.6) Make sure, that the option Connect by using a bridge (default) is selected and switch to the menu Port table afterwards.
Image Modified 1.7) Make sure, that no Bridge group is assigned to the logical interface LAN-1.
Image Modified 1.8) Edit the LAN interface selected in step 1.4 (in this example LAN-2) and the xDSL interface (in this example xDSL-1).
Assign an unused Bridge group to both interfaces (in this example BRG-2).
Image Modified Image Modified 1.9) The Port table has to appear as shown below afterwards.
Image Modified 1.10) Go to the menu Interfaces → WAN → Interface settings → XDSL modem operation.
Image Modified 1.11) In the dropdownmenu for the parameter Mode select the option Bridge.