Hello, I have 2 network cards on my server (running with Red Hat ES 3 update 1) The first one is the main one, which is always working, the second one is a backup. I'd like to know: how to configure my 2 network cards to change the default card in case of problem (keeping the same configuration: IP, gateway...). I will explain it with this: # ... eth0 is working and eth1 is ok but not running. A network problem occured # ... eth1 is running and the machine keeps the same network identity (except its mac adress) the network problem is solved # ... Eth1 will stop and eth0 will be working again. Thanks Charles.