$ sudo ip netns exec bridge ip link set ns3-br0 up
$ sudo ip netns exec bridge ip link set ns3-br0 up
</pre>
*Ip
<pre>
$ sudo ip netns exec ns1 ip address add 192.0.2.1/24 dev ns1-veth0
$ sudo ip netns exec ns2 ip address add 192.0.2.2/24 dev ns2-veth0
$ sudo ip netns exec ns3 ip address add 192.0.2.3/24 dev ns3-veth0
</pre>