(adsbygoogle = window.adsbygoogle || []).push({}); You will need modern warfare 2 to do this fix it may work with world at war but not sure.



1. Load up modern warfare 2 and go to the multiplayer screen where you see your nat type which it should say is open.



2. Press eject on your ps3 so the game ends and goes to ps3 main screen and take out modern warfare 2 and put in black ops and load up the game. Do not turn off or reset your ps3 after ejecting modern warfare 2.



3. If you check your nat in black ops now in the option screen it should stay open and you can play unhindered



This worked fine for me and I assume its something to do with the fact that all the latest call of duty games use the same ports and modern warfare 2 opens up these ports so that black ops can use them once you swap over.



This seems to be a effective temporary fix until treyarch can get this problem sorted.

I hope this work for you's. Rep+ If i helped :derp:

(I think you need your Mw2 Nat Type on Open to work)

Setting your 360 to DMZ will open your NAT:
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PS3:
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EDIT: not to flame the OP, but whatever trick you are doing will not actually give you an open NAT. NAT deals specifically with ports and router settings.

This works for some people I don't know why but I think it might be something to do with MW2 Using UPnP and Black Ops Not.

Thanks for this