# Loopback device:
auto lo
iface lo inet loopback

# device: eth0
auto  eth0

# IPv4 Configuration
iface eth0 inet static
  address   46.4.78.73
  broadcast 46.4.78.95
  netmask   255.255.255.224
  gateway   46.4.78.65
  post-up   mii-tool -F 100baseTx-FD eth0
  # default route to access subnet
  up route add -net 46.4.78.64 netmask 255.255.255.224 gw 46.4.78.65 eth0

# IPv6 Configuration
iface eth0 inet6 static
  address   2a01:4f8:140:5484::b00b
  netmask   59
  gateway   2a01:4f8:140:5480::1