auto lo
iface lo inet loopback

auto p1p1
iface p1p1 inet static
   hwaddress 3C:FD:FE:9C:6F:00
   address 172.20.1.234
   netmask 255.255.252.0
auto p1p1.602
iface p1p1.602 inet static
   address 172.20.9.234
   netmask 255.255.252.0
   vlan-raw-device p1p1
   gateway 172.20.8.1
