I have identified a consistant problem. I have an actiontec DSL modem/ router and have some problem with Firefox and other web brosers not being able to resolve domain names. I also have a co-worker that has a very similar setup (same actiontec DSL modem) and he has the same problem. ping and other things work fine, it is only firefox (and maybe yum, not sure). I have found this thread
on the forum with exactly the same issue that I and my friend have.
Other wierd symptoms are that Konquer works in KDE, and everything works fine with my laptop now that it connects wirelessly (same modem using FC5). I hoping that some of you will help slueth this out. By the way, I had the same problem with FC5 and 6 as well as with Ubuntu.
Any suggestions are well recieved. I will try to be as responsive as possible, but while I am at work I won't be able to do anything with it, so if you need me to print out something it might take a little while.