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Configuring a Router With Two Interfaces

The /etc/init.d/network script is designed to automatically detect and configure a router with two interfaces if the default naming scheme for the interfaces is used. By default, the Internet addresses of the primary and secondary interfaces are derived from the /etc/sys_id file. The primary interface uses the name in the sys_id file. The secondary interface prefixes gate- to the name specified in the sys_id file.

To set up a router with two interfaces using the default naming scheme, follow this procedure:

  1. Log in as root.

  2. Assign valid Internet names and addresses to both interfaces in the /etc/hosts file. For example, the /etc/hosts file entries for the primary and secondary interfaces on the station biway might look like this:

    192.26.75.2 biway
    192.26.80.3 gate-biway

  3. Ensure that the router has the appropriate name in its /etc/sys_id file. Following this example, the /etc/sys_id file should look like this:

    biway

  4. Reconfigure the kernel and reboot the station to initialize your changes and interfaces. Some systems prompt you for permission, as in the following example. Others simply return a shell prompt. In either case, enter the reboot command when the kernel has been reconfigured:

    /etc/autoconfig

    Automatically reconfigure the operating system? (y/n)y

    reboot

Note: If you do not want to use the standard router naming scheme, you must modify the /etc/config/netif.options file. "Modifying the Network Interface Configuration" details the procedure for changing an interface name.

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