# Configure Loopback
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.21
netmask 255.255.255.0
gateway 192.168.1.1

auto eth1
iface eth1 inet static
address 192.168.0.21
netmask 255.255.255.0
gateway 192.168.0.1