Hiya. Both PCs are connecting wireless to the router using Linksys speedbooster adapters. As for forwarding one IP address to one PC and not the other, I'm really not sure. The only setting changes or alterations I have done is on the PC that isn't working correctly. I connected the PCs to the router using the wireless adapter software. Other than that I haven't changed anything. Its only through bittorrent that I've noticed a problem.