Losing internet connection on Fedora Core 2

[Luís Martins]

Greetings.

I recently installed FC2 final on a PC connected to the Internet through 
a USR 9003 Router (ethernet, not USB). I also have other machines 
connected to the same router with no problems.
The issue I have is this: my Internet connection is lost when I use FC2. 
It happens on all machines I try FC2 and sometimes the only solution to 
the problem is restarting the router.

Can someone help me? I'm a linux newbie, but I've tried googling for the 
problem and the only solution I've found involved a "echo" command and 
it only worked sometimes and for a short period of time. After a few 
minutes the connection was lost.

Thanks,
Luís