Linux Administration Cookbook

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If you want to see our routed traffic that's hitting centos2, log onto your second VM and make sure that tcpdump is installed:

$ sudo yum install -y tcpdump

Next, ensure that your extra route from the before is in place on centos1, and start a ping going to any address in the range:

$ ping 172.16.0.3PING 172.16.0.3 (172.16.0.3) 56(84) bytes of data.

Back on centos2, start tcpdump against our eth1 interface:

$ sudo tcpdump -i eth1

You should start to see ICMP echo requests from centos1, without a response:

12:48:26.735055 IP 192.168.33.10 > 172.16.0.3: ICMP echo request, id 1696, seq 1, length 6412:48:27.736195 IP 192.168.33.10 > 172.16.0.3: ICMP echo request, id 1696, seq 2, length 6412:48:28.738030 IP 192.168.33.10 > 172.16.0.3: ...