router broblems

[mrastlin]

we're using a belkin router with a cable modem when we host a land warior game it wont let any one join the game but if we bypass the router and connect directly to the modem it works fine we've disabled the firewall on the router and still no go what could we be doing wrong and could someone tell us what port we should use for land warriors we've tried port 4446 is this the right one