/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.1.6
        network 192.168.1.0
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.254

# The secondary network interface
auto eth1
iface eth1 inet static
        address 10.10.10.1
        network 10.10.10.0
        netmask 255.255.255.0
        broadcast 10.10.10.255