Please see this posting and the answers followed
http://web.wenxuecity.com/BBSView.php?SubID=computer&MsgID=102571
Basically, the routers that are connected to your first router have to be set to work just as an access pointer.
http://web.wenxuecity.com/BBSView.php?SubID=computer&MsgID=102571
Basically, the routers that are connected to your first router have to be set to work just as an access pointer.