Router Configuration for DirectX

I have an SMC Barricade Router and have been trying to get Total Annihilation (which uses DirectPlay, a component of DirectX) to work without having to setup the system as a DMZ (since that is for my real server). Microsoft’s web site had very useful instructions that let me get the LAN systems working as clients, but people on the internet cannot access a game hosted from on the LAN. If anyone has ever gotten this working without using the DMZ it would be very helpful.