I installed YDL 3.0.1 a couple months ago, and I've been having some real weirdness with redhat-config-network. I'd had things running fine with 3.0, but I wanted to try out YDL 4.0 and a couple other distros so I ended up reinstalling everything.
Anyway, here's what happens.
Somehow redhat-config network is easily confused about which device (iBook Ethernet, Apple Airport card) is eth0 and which is eth1. I had first read that there was a kudzu bug, so I disabled kudzu and manually removed extra references to network hardware in /etc/sysconf/hwconf. But the weirdness continues... sometimes a device will appear twice under the Hardware tab in r-c-n, and creating a connection is fraught with peril. Pretty much I've been able to get away with only using the Airport, which does work, but I'd like to be able to have wired connections available as well.
Doesn't seem to be an update for r-c-n, either.