Router that's "plug and play"?............Just google Port Forward, it's a nice little site that will help you with forwarding data to specific computers on your network from specific ports.
I had problems too until I hit up the site Likwid's talking about. www.portforward.com All I had to do was log into my router and assign a port to my torrent software (I use utorrent) then log into utorrent and in the preference section fill in that port for incoming connections.