--- 198.51.100.1 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2025ms
</pre>
*ルーターにもルーティングエントリを追加
<pre>
$ sudo ip netns exec router1 ip route add 198.51.100.0/24 via 203.0.113.2
$ sudo ip netns exec router2 ip route add 192.0.2.0/24 via 203.0.113.1
</pre>