Network configuration
From DSL Wiki
To configure network interfaces start the DSLPanel and click on Netcardconf.
[edit]
Manual configuration
Edit /etc/network/interfaces and add each network interface like this:
iface eth0 inet static address 192.168.0.111 netmask 255.255.255.0 gateway 192.168.0.1 iface eth1 inet dhcp
See also [http://www.debian.org/doc/manuals/reference/ch-gateway.en.html Debian Reference - Network