SLES11 SP2. How can i find out if there is some "rogue" piece on my SLES11 install. Heres what we have happening:

With the server plugged in, it appears as the server is flooding the network where we lose intranet and internet. I have narrowed it down to the server. I also installed a different PCI NIC and the same thing happens. I installed clamAV but unable to update the definitions due to not being able to plug in to the network. How can i tell if there is something "rogue" in the SLES install?