According to this "video games" website, you only need to forward UDP ports 9000 through 9013.. I cannot find any other documents that claim any more exotic configuration requirements.
http://ac.turbine.com/index.php?opti...=454&Itemid=76
Presumably, a value rule for this would be:
Code:
rdr pass on $ext_if inet proto udp from any to any port 9000:9013 -> $silly_gamer
Hope that helps.