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This Worked For Me Its Easy And Quick With No Port Forwarding or Wired...

I Also TMAPI By A Debug IP Which At First Changed My NAT Type To Moderate or Sometimes Strict

I Found With MW2 That Was Always Open Never Moderate Or Strict

But Other Cods Thats A Different Story




Im With TalkTalk with Router - HG633 (Fibre)

1. Type In Your Browser 192.168.1.1 or 10.1.1.1 or 192.168.0.1
   
2. SignIn Using The Username And Password On The Back Off The Router Usally Username - Admin, Password - Admin
   
3. Go Too Firewall And Locate The DMZ Section And Depends On Your Router Your Need Too Add Your PS3 IP In There Or Scroll Down Until You Find Your IP/MAC Address, With Mine Its The Mac Address
   
4. Save It...
   
5. Turn The Router Of For 15 - 30 Mins and Then Switch It Back On
   
6. This Should Have Worked
   

Hey Mods! You should sticky this, oh wait...
Seriously though, instead of posting something that was already above this, you should go way in depth and add more to the tutorial. Such as adding what it's like for all ISP's and all kinds of routers not just "oh it depends" NO, you gotta make this shit clear for people. Add pictures for all types with lots of pointers and colours. Bright colours, bright colours are the shit. Have a good day, I'm out

This Was A Quick Tutorial and i dont know about every router its not hard tho the sticky one is completely different

May be useful to add, for Italian TIM connections it is sufficient to set PPPoE with user and password "aliceadsl" (just in case someone brings his ps on vacation in Italy xD)