auto lo
iface lo inet loopback
	up ip addr add 2001:db8:10::12/128 dev lo
	down ip addr del 2001:db8:10::12/128 dev lo

auto lan
iface lan inet manual
	up ip link set up dev lan
	up ip addr add 2001:db8:10:2::12/120 dev lan
	down ip addr del 2001:db8:10:2::12/120 dev lan
	down ip link set down dev lan