Doom Multiplayer Help Needed

Here is the deal.

I have two computers hooked up to the internet through a D-Link router.


I want to play a multi player game of "Doom 95" through these routers.


So how do I set it up. I truly have no what setting I should use.

I have all three of the old versions of Doom so if one worked better then the others that fine....I'll use that one.