Hi, I want to play unreal 99 on my home lan but for some reason when I set up a game, 1 computer can play but the other can't. 

Basically, I set it up on my computer which is using a cable into a wireless router, started a game and it waits for players to join. I then use the other pc which is wirelessly connected to the router and join the game. On the wireless one I can controle a player and wander round and fire my gun but on the direct cable one I can only get a live feed from the other computer. I don't get what I'm doing wrong

Thanks, 

Jimmie