$ sudo ip netns exec router2 ip link set gw2-veth1 up
$ sudo ip netns exec ns2 ip link set ns2-veth0 up
</pre>
*IP
<pre>
$ sudo ip netns exec ns1 ip address add 192.0.2.1/24 dev ns1-veth0
$ sudo ip netns exec router1 ip address add 192.0.2.254/24 dev gw1-veth0
$ sudo ip netns exec router1 ip address add 203.0.113.1/24 dev gw1-veth1
$ sudo ip netns exec router2 ip address add 203.0.113.2/24 dev gw2-veth0
$ sudo ip netns exec router2 ip address add 198.51.100.254/24 dev gw2-veth1
$ sudo ip netns exec ns2 ip address add 198.51.100.1/24 dev ns2-veth0
</pre>