auto lo
iface lo inet loopback

auto vlan3
iface vlan3 inet manual
	up ip link set up dev vlan3
	up ip addr add 10.40.3.7/24 brd + dev vlan3
	up ip addr add 2001:db8:40:3::7/120 dev vlan3
	up ip route add default via 10.40.3.1 dev vlan3
	up ip route add default via 2001:db8:40:3::1 dev vlan3
	down ip route -6 del default
	down ip addr del 2001:db8:40:3::7/120 dev vlan3
	down ip addr del 10.40.3.7/24 dev vlan3
	down up link set down dev vlan3