I just upgraded from FC4 to FC5 and I'm having a problem getting multiple ip addresses to work on the same card. It's a very odd problem. I think it has something to do with routing and the gateway because the 2nd ip address works inside the same subnet, but when it's confronted with a packet to send outside the subnet, it chockes. For instance I can ping it inside the subnet, but not outside.
Here are my config files. Ip addresses are not correct, but show what's going on.
# VIA Technologies, Inc. VT6102 [Rhine-II]
# Please read /usr/share/doc/initscripts-*/sysconfig.txt
# for the documentation of these parameters.