$ sudo ip link set ns1-veth0 netns ns1
$ sudo ip link set ns2-veth0 netns ns2
</pre>
* 確認
<pre>
$ sudo ip netns exec ns1 ip link show
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
4: ns1-veth0@if3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether ca:f0:3b:a9:2a:eb brd ff:ff:ff:ff:ff:ff link-netns ns2
</pre>