$ sudo ip link set gw2-veth1 netns router2
$ sudo ip link set ns2-veth0 netns ns2
</pre>
*up
<pre>
$ sudo ip netns exec ns1 ip link set ns1-veth0 up
$ sudo ip netns exec router1 ip link set gw1-veth0 up
$ sudo ip netns exec router1 ip link set gw1-veth1 up
$ sudo ip netns exec router2 ip link set gw2-veth0 up
$ sudo ip netns exec router2 ip link set gw2-veth1 up
$ sudo ip netns exec ns2 ip link set ns2-veth0 up
</pre>