My network seems to work fine with Knoppix, but not with Fedora Core 3. I'm trying to figure out why.

lsmod shows no ethernet module; modconf -c shows
Code:
alias eth0 off
ifconfig shows eth0 as running and I am able to access the internet. How can I find out how Knoppix is doing this so I can set it up under Fedora Core?

Thanks.