# loopback
auto lo
iface lo inet loopback

# eth0
auto  eth0
iface eth0 inet static
  address       xxx.xxx.77.119
  broadcast     xxx.xxx.77.127
  netmask       255.255.255.255
  gateway       xxx.xxx.77.97
  pointopoint   xxx.xxx.77.97

# default route subnet access
up route add -net xxx.xxx.77.96 netmask 255.255.255.224 gw xxx.xxx.77.97 eth0