I have two computers behind Linksys router. I like to use peer to peer networks so I forwarded ports on Linksys router. Unfortunately, I still have NAT problem in my torrent client and can not receive incoming connection which degrades my downloading speeds. Do you know what is happening with this router?
You should first check few things before accusing router. Many torrent clients are changing ports randomly upon every start so if you forwarded only one port make sure that torrent clint is using only this port. If you experience problems again then update router firmware. Finally, if nothing helps you should buy a new router.