ip netns exec $1 ifconfig veth1 10.1.0.2 netmask 255.255.255.252
ip netns exec $1 route add -net 224.0.0.0 netmask 224.0.0.0 veth1
+# force mtu size (we want to test that Nether's rules can deal with fragmentation)
+ifconfig veth0 mtu 1500
ifconfig veth0 10.1.0.1 netmask 255.255.255.252
route add -net 224.0.0.0 netmask 240.0.0.0 veth0