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I tried like 50 different tutorials and some of them were so hard that they seriously wanted me to reprogram my router or similar shit like that (You can 'WTF?!' now).
And now, after 3 Call of Duty games (4, 5 & 6) I found this tutorial so easy that I ROFL'

first and didn't believe it.
Here are the steps (PS3):
1. Go to your system's settings and find "System information".
2. There's an ip-adress right there, write it up.
3. Go to your modem's/router's settings and find a setting where it says '

MZ' (DeMilitarizedZone) somewhere.
4. Input the IP you wrote-up.
5. Save settings ... TWICE.
6. Restart modem with current settings.
7. Restart PS3.
8. ????
9. PROFIT!
Note:
It didn't show TYPE 1 at first for me, but I played like 2 or 3 games and after those I was the host on nearly every game
Then I checked my NAT-type and it was 1 n.n
P.S
I don't bother explaining ie. how to get to your modem/router's settings ... find out on your own or something.