Configuring Network Interfaces by Hand in Ubuntu

Edit the /etc/network/interfaces

Add the following lines per network interface (example for static IP)

auto eth1

iface eth1 inet static

    address 192.168.xx.xx

    netmask 255.255.255.0

    broadcast 192.168.xx.255
    network 192.168.xx.0
    gateway 192.168.xx.xx