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allow-hotplug eth1
iface eth1 inet static
  address 1.1.1.2
  netmask 255.255.255.0
  gateway 1.1.1.1

iface eth1 inet6 static
  address 2001:da8::2
  netmask 64
  gateway 2001:da8::1

# https://wiki.debian.org/NetworkConfiguration#Bridges_and_VLANs
# see this for why VLAN interfaces don't need to be declared first here
auto br-lan
iface br-lan inet static
  address 192.168.0.1
  netmask 255.255.255.0
  bridge_ports enp2s0.177 enp1s0
  bridge_stp on
  bridge_maxwait 10

iface br-lan inet6 static
  address 2001:da8::1
  netmask 64

auto sit-test
iface sit-test inet6 v4tunnel
  address 2001:db8::d:2
  netmask 128
  ttl 255
  endpoint 1.1.1.1
  local 2.2.2.2
  up ip -6 r add 2001:db8::d:1/128 dev sit-test

# when behind NAT use address on NIC in 'local'
# GRE tunnels can also carry IPv6 traffic, use post-up stmt to add IPv6 addresses and routes
auto gre-test
iface gre-test inet tunnel
    mode gre
    local 10.0.0.2
    endpoint 1.1.1.1
    address 215.0.0.2
    netmask 32
    dstaddr 215.0.0.1
    ttl 255