Venkat Chandra wrote: > auto eth0 > iface eth0 inet static > address 10.19.175.242 > gateway 10.19.175.241 > > auto eth1 > iface eth1 inet static > address 192.168.164.2 > ... > The network cables from these two interfaces terminate on a Cisco 6509 > switch. This is bizarre. Why are both cables going to the same switch? Can you get another switch and create two "proper" sub-nets, one for the 10.x segment and one for the 192.x segment? Then make sure routing on the host is set up properly so that replies get routed to the right interface? > I can run tcpdump on the > interfaces separately and I can see ICMP Requests coming in on both the > interfaces but only one of the interfaces responds with an ICMP Reply. An explicit dump would be interesting, and in particular to see if an ICMP request comes in the 192 interface and the reply goes out the 10.x interface. I'm not an expert, but what you are doing here seems prone to problems at best, and flat out wrong at worst. j