I've discovered the fix for people who can't play Gunz behind a router that has built-in firewall that can't be disabled. If you join any game and only find yourself moving and everyone else just freeze there, this guide will show you how to fix it so you can play Gunz behind your Firewall Router, it will also help reduce lag and allow you to play Gunz with multiple machines behind your router.
Router Solution for Gunz - The Duel
Discovered on Oct 16th 2006 30AM Pacific Standard Time
Located at "Flippers n00b Support" section of the forum, read the pinned topic, please do not redistribute this guide elsewhere, you may link it directly, which is located at: http://www.shintasoft.com/forum/viewtopic.php?t=17