some on-line games (for example: half life) will use udp packets with large length to transfer data. these large udp packets need to be fragmented. as secure firewall, v2900 router will, by default, reject these kinds of packets to avoid to be attacked by outside hackers. you can enable "accept incoming fragmented udp packet" function to accept these kinds of packets. then you can play these kinds of on-line games. of course, it might have some security concerns.

advanced setup >> ip filter / firewall setup >> general setup