Sure.
Do this to post the output of some commands-
1) open a terminal
2) run these commands and highlight the text, then right-click in order to paste it into a post.
lspci -v
lsmod
ifconfig -a
If the text is too long in your terminal to get it all, you can add this to the command
> /home/your_username/somefile.txt
to send it to a text file in your home directory, then open the text file and copy/paste the contents.
I'm just guessing, but if your sig is the box you're runnning Linux on, it may be that that board has gigabit ethernet onboard, and fedora does not have that driver loaded by default. If I remember correctly, that uses the sk98lin driver. You may be able to find an rpm for that, or you might have to compile it yourself. Either way, it should not be too dificult for the Alt OS crew to help you with.