Sorry, but your post about NOTHING, dmz, upnp, portforwarding not help TO U IF u play with players from around the world, Brazil, USA, Mexico, Canada, Australia, Japan, China and others!
If u can add ip adress to dmz of yo console there no need to portforwarding.
Sorry for my English, this is not my native lang!
English
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Then you are still looking at uPnP + DMZ