auto eth0
iface eth0 inet static
  address 5.101.171.215/28
  gateway 5.101.171.209
  mtu 9000
iface eth0 inet6 static
  address 2a01:a500:2981:1::d7/64
  gateway 2a01:a500:2981:1:ff:ff:ff:ff
  mtu 9000

auto eth1
iface eth1 inet static
  address 10.254.0.215/24
  mtu 9000