# The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.91.222 netmask 255.255.255.0 gateway 192.168.91.223 up sysctl -w net.ipv4.ip_forward=1 auto eth1 iface eth1 inet static address 172.16.0.2 netmask 255.255.0.0 auto eth1:253 iface eth1:253 inet static address 172.16.0.253 netmask 255.255.0.0 up /root/setup_routing.sh #auto eth1:254 iface eth1:254 inet static address 172.16.0.254 netmask 255.255.0.0 up /root/setup_routing.sh