Hi, I have a WRT54GS V4 and I'm using latest Linksys firmware. I have tested it with some games or voip program and a P2p working at same time and it doesn't works fine. I have a cable connection 4 Megabytes (download) / 150 Kbps (upload) connected with the router. I have limited the upload to 120 Kbps and I have tested filtering though Mac address, application port and ethernet port, but doesn't works fine. When I'm playing for example I get a ping of 40-50 ms, but it raises to 250-500 ms. Anyone knows any firmware that implements Qos filtering and works fine with this aplications? Thanks in advance. Pd. Sorry by my english level.