Seitenhistorie

• LCOS as of version 8 (download)
• LANtools as of version 8.50 (download)

• A LANCOM router with integrated xDSL modem (e.g. a LANCOM 1781VA)
• An external xDSL modem for each of the other Internet connections to be configured. Please refer to the technical specifications of your device to determine the number of Internet connections that your LANCOM router can manage.

• Two DSL connections are to be load balanced so that they can both be used at the same time.
• The first Internet connection is to be implemented with the integrated xDSL modem in the LANCOM router.
• The second Internet connection is to be implemented with an additional external DSL modem, which is connected to the Ethernet Port ETH 1 on the LANCOM router.
• The LANCOM router handles the dial-in and logging on at the provider for both of the DSL connections.
• The LANCOM router is already connected to the local network via Ethernet interface ETH 2.

• The LANCOM 1781VA enables you to operate up to a maximum of four DSL connections. For clarity, this example configuration is limited to two DSL lines.

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For load balancing, it is important to know the data rates of the xDSL connections. This allows the load balancer to distribute the data load according to the capacities of the DSL lines.

The data transfer rate of the internal xDSL modem in the LANCOM router is already known, since it was negotiated with the provider during DSL synchronization.

However, the LANCOM router does not know the data transfer rate of the external xDSL modem, so this must now be entered manually into the connection settings for the DSL interface:

1. Go to the menu item Interfaces -> WAN.

2. Select the DSL-1 interface from the interface settings:

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3. In the fields downstream and upstream rate, enter the data transfer rates for the DSL line.

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4. Accept your entries with OK.


Configuring load balancing:

1. In order to configure the load balancing, switch to the menu item IP Router -> Routing -> Load Balancing.

2. Next, activate load balancing.

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3. Then open the load-balancing table and define a virtual remote site named LOADBALANCER. You can use any name of your choice. When using a loadbalancer it is recommended to activate the Client binding function (available as of LCOS 9.10, also see

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4. Assign the two DSL remote sites INTERNET1 and INTERNET2 to the virtual remote site LOADBALANCER.

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5. Accept your entries with OK.

6. Exit the load balancing table and open the ipv4 routing table.

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7. Open the routing entry for the default route with a double click.

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8. Assign the load balancing device to the default route LOADBALANCER. Click on OK.

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9. The routing table should then look as follows:

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10. Close the routing table and write the configuration back to the LANCOM router.

11. After writing the configuration to the device, the two Internet connections are established. This concludes the configuration.


Function check:

Proceed as follows to verify that everything is functioning as expected:

1. Start a SSH session on your LANCOM router (e.g. Putty).

2. Using the command line interface, enter the command trace # load and press Enter.

3. The trace output should appear as in the figure above.

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4. Stop the trace by entering the command trace # load again. Alternatively you can simply close the SSH client.

• The load balancing mechanism reacts to the capacity utilization levels (number of sessions) of the Internet connections and distributes packets appropriately between the DSL remote sites.

• With load balancing, the two xDSL connections are

• . It merely distributes the load.