auto lo
iface lo inet loopback

# device: eth0
auto  eth0
iface eth0 inet static
  address   ${IP1}
  broadcast ${BC1}
  netmask   ${MASK}
  gateway   ${GW}
  post-up mii-tool -F 100baseTx-FD eth0

#additional IPs
auto  eth0:0
iface eth0:0 inet static
  address ${IP2}
  netmask ${MASK}
  gateway ${GW}

auto  eth0:1
iface eth0:1 inet static
  address ${IP3}
  netmask ${MASK}
  gateway ${GW}

# default route to access subnet
up route add -net 46.4.77.160 netmask 255.255.255.224 gw 46.4.77.161 eth0