First you must tell me what you are trying to do... becaus you talk about OPEN NAT (i'm not an expert in gaming) but in th network world NAT stand's for Network Address Translation from the WAN side of the router to the LAN side... and Upnp is a protocol, nothing to do with DMZ (DeMilitarized Zone) which involves opening ALL ports in the FireWall of your router to a specific machine on the LAN side....
Dont forget opening ports is opening doors to hackers... (I think the term NAT in the gaming world has some thing to do with controlling access to other players) post me if i'm wrong!!!
Cheers!
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