This is a pretty simple problem. What I'm tryig to do is set up two Linux machines in a network, using ethernet. Now one of the machines has two ethernet cards, one of which is connected to my campuses backbone. The problem I'm having is that I can't get the two Linux machines to talk to each other. I know that all three ethernet cards are working, and I know that the cable connecting them is good (I've tested this). I'm using IP address of 192.168.2.1 and 192.168.2.2, which I beleive are of the addresses reserved for this kind of thing. When I check the kernel routing table, the 192.168.2.0 network appears, and is mapped to the correct device (eth1 and eth0, respectively). But still no data is going between the two machines (ie. ping doesn't work). I'm using RedHat Linux 4.2, with kernel 2.0.30. Thanks.