auto eth0
iface eth0 inet static
  address 192.168.0.7
  netmask 255.255.255.0
  gateway 192.168.0.1
  up /sbin/route add -net 10.0.0.0 netmask 255.0.0.0 gw 192.168.0.2
  down /sbin/route del -net 10.0.0.0 netmask 255.0.0.0