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Description:
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.
Important:


Hinweis

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!




Requirements:



Procedure:
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
Connect the main gateway to the LANCOM modem by means of an Ethernet cable.
) Open the configuration of the Modem router in LANconfig and go to the menu Interfaces → LAN → Ethernet ports.
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1.3
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 in the unused bridge group BRG-2.
Also make sure that used ). You can do this in the menu Interfaces -> LAN -> Interface Settings.
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1.4 Switch to the menu Interface -> WAN -> Interface Settings -> xDSL modem operation and configure the VDSL port to Bridge Mode.
  • For operation on VDSL connections no further parameter needs to be changed.
  • For ADSL connections (for example, Deutsche Telekom), you must configure the ATM parameters to the following values:
    • VPI: 1
    • VCI: 32
    • ATM-Modus: LLC-Mux
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1.5 Deactivate the DHCP server of the device in the menu IPv4 -> DHCPv4 -> DHCP networks.
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1.6 In the IPv4 -> General -> IP networks menu, assign a local IP address from an unused IP address range (for example,
) 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
also assigned to the correct physical port (for example, ETH-1
assigned to it.
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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. 
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1.5) Go to the menu Interfaces → LAN → LAN bridge.
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1.6) Make sure, that the option Connect by using a bridge (default) is selected and switch to the menu Port table afterwards.
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1.7) Make sure, that no Bridge group is assigned to the logical interface LAN-1.
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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).
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1.9) The Port table has to appear as shown below afterwards.
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1.10) Go to the menu Interfaces → WAN → Interface settings → XDSL modem operation.
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1.11) In the dropdownmenu for the parameter Mode select the option Bridge.

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Info

Depending on your Internet provider it is possible that the parameters VPI, VCI and the ATM mode have to be changed. Please ask your provider if necessary.


1.12 In the menu IPv4 → General → IP networks assign an IP address from an unused IP range to the network INTRANET (in this example

192.168.3.254/24)

.
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1.7

and make sure that

in

the

Menu Interfaces -> LAN -> LAN bridge settings the option Connect using a bridge is activated.
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1.8

interface LAN-1 is selected (see step 1.3).


Hinweis

The assignment of an unused IP address range is mandatory. If an IP address from a local network configured on the Gateway router is entered on the Modem router and an IPoE remote site with an IP address from the local network is created on the Gateway router to ensure Management access (see step 3), the local network and the WAN (MANAGEMENT) will have the same IP address range. This will lead to routing problems! 

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1.13) Deactivate the DHCP server of the device in the menu IPv4 → DHCPv4 → DHCP networks.
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1.14) The configuration of the Modem router is now complete. Write the configuration back to the device.


2
.
) Set up the Internet connection on the main gateway (Gateway router) :
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.
2.1) Start the setup wizard in LANconfig and select the option Set up Internet access.
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2.2) In this example, a new IPv4 connection is to be created.
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2.3) Select the Ethernet interface (External Modem / Router) setting to use an external modem.
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2.4) In this example, the external VDSL modem is connected to the WAN port of the LANCOM router, so WAN must be selected as the Ethernet connector in the following dialog.
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2.5) Select your country.
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2.6) Select your Internet service provider in the following dialog.
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2.7) In the next dialog you have to select your product.
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2.8) In the following dialog, enter the access data that you received from your provider.
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2.9) Enter the VLAN tag that your provider uses. For Deutsche Telekom VDSL connections the VLAN-ID is 7.
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2.10) In this example, no backup connection is used.
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2.11) Quit the setup wizard to set up the Internet connection with the Finish button.
The configured values are then written to the LANCOM router.
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2.12) After the configuration has been written back to the device, the setup wizard asks if you want to continue with another wizard.
Click No in this dialog because the configuration steps to set up the VDSL connection are complete.
3.
2.13) Connect the Gateway router to the Modem router by means of an Ethernet cable.


3) Make sync status of the
LANCOM modem
Modem router accessible from the network (optional) :
3.1
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) with a hold short of 9999 seconds, the layer name IPOE and the DSL port 1.
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3.2 Then switch to the menu Communication -> Protocols -> IP Parameters and create an entry with the following values:
  • Remote site: Management
IP address: an IP address from the IP address range configured in step 1.6 (e.g.
) Configuring the Plain Ethernet connection via the setup wizard:
On the Gateway router set up a Plain Ethernet connection via the setup wizard Set up Internet access.
  • Select an unused Ethernet Port which deviates from the port selected in step 2.4 (in this example ETH 4).

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  • In this step you have to assign an IP address as well as the corresponding Subnet Mask from the IP address range assigned in step 1.12 (in this example the IP address 192.168.3.1
)Netmask: The netmask of the unused IP address range configured in step 1.6 (here
  • with the Subnet Mask 255.255.255.0).
Info

Entering a Default gateway is not necessary in this case, as no routing is to be performed via this connection.

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  • In this step it is imperative that you select the option Leave the current default route (not recommended).
  • Otherwise the Internet connection set up in step 2 won't be functional anymore!

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3.
3 In the IP Router -> Routing -> IPv4 routing table menu, , create an entry for the network 192.168.3.0/24, which points to the remote site Management and in which IP masking is deactivated.
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3.4
2) Manual configuration steps on the Gateway router:
3.2.1) Open the configuration of the Gateway router in LANconfig and go to the menu IP Router → Routing → IPv4 routing table.
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3.2.2) Click Add to create a new routing entry.
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3.2.3) Edit the following parameters:
  • IP address: Enter the network address of the network entered in step 1.12 and 3.1 (in this example 192.168.3.0).
  • Netmask: Enter the corresponding Subnet Mask (in this example 255.255.255.0)
  • Router: In the dropdownmenu select the Internet remote site created via the setup wizard in step 3.1 (in this example MANAGEMEN). 
  • IP masquerading: Select the option IP Masquerading switched off.

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3.2.4) Write the configuration back to the device.
The
LANCOM modem
Modem router can now be reached and read out via the IP address 192.168.3.254.
Info:


Info

The sync status of the

xDSL

Modem 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.