1. To get your hostname, in a terminal window, type "hostname". You'll get back something like "localhost.localdomain". Enter this for both the hostname and the primary name + domain.

2. If you only have one net card, the net device will be eth0.

3. For the kernel module, you need to choose the module (driver) used by your net card from the drop-down list. If the correct module doesn't appear in the list, that means your kernel doesn't natively support it. If that's the case, you'll have to obtain and install it as an external module.

If you need to find out which module your NIC uses, go to http://www.scyld.com/network/index.html#pci (the modules and installation instructions are there also), or post the model of your card.

I didn't see my card on that page. Mine is a D-Link DFE-550TX; the closest thin was a D-Link DFE-530TX.

You won't see the actual names of cards listed under the kernel module drop-down list, only the names of the modules they use. I believe your card should be using the "Sundance" driver. If you don't see it in the list, your kernel doesn't, as I said, have native support for it.
Which Linux distro (and version) are you using? That could help us sort out whether or not your card is supported. For more info, do a search on Googlefor the keyphrase

I'm using Red Hat 6.1, but I've been thinking about upgrading to 7.1 soon. I thought it would just be a configuration problem though. If my kernel doesn't support it, I'll just wait.