force a strict nat on linksys router

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http://serverfault.com – I'm trying to force a strict NAT on a Linksys E2500, but I'm unsure how to do that. Normally with my old Linksys router, I would have to do some port forwarding to get an open NAT, however I didn't have to do that with this new one. It still has the option to port forward, DMZ, and all of that. I need to brush up a bit on my routers/networking stuff, so I'm not quite sure what's going on, or what extra thing this new one has that makes it so I don't need to port forward. EDIT: I am terribly sorry... It seems I was able to figure it out shortly after I posted this. I knew of the term "UPnP", b (HowTos)