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Tcpdump

From GarrettHoneycutt

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Check for asymmetrical routing

Are packets coming back on the correct interface?

 Host1:
   - eth0 - 10.10.10.10/24
   - eth1 - 192.168.10.10/24
 Host2:
   - eth0 - 192.168.10.20/24

Run tcpdump on both interfaces in different terminals on Host1 and ping the eth0 interface from Host2

Host1:

[root@host1]# tcpdump -i eth0 -n icmp

and in other terminal on Host1:

[root@host1]# tcpdump -i eth1 -n icmp

Host2:

[user@host2]$ ping 10.10.10.10

This will show you where the replies from Host1 are coming from.