Some info on NAT types. (Technical)

NAT means Network address translation. NAT has various types here a are some examples.

How to find what NAT type you have.

If you want to know if you are open, moderate or strict. Go to the find game part of MW2 multi-player and look at the bottom of the screen, it will say NAT type then open, moderate or strict. If you want to see your NAT type number, then in your ps3 go to, Settings > Network settings > Settings and connections Status list.

NAT Type 1 is when you are connected directly to your modem with your ps3 by Ethernet cable. This is the best way to see if the problem is your equipment or a ISP or sever issue. So always try this first to see if it corrects your issue. If your problem is solved by a direct connection to your modem then the problem is somewhere with your router/ps3 settings or your equipment is starting to fail. If it does not correct the issue then you need to contact your ISP about the issue for help.

NAT Type 2 is when you are connected through a router into a modem. Now you can have three types of NAT type 2, open, moderate, strict. These are associated with router firewalls, ports and upnp settings. Best way to get open is to set your ps3 up with a static ip address in a DMZ in your router.

NAT Type 3 is port restricted. This means by default specific ports an options like chat, video, etc are disabled. This is usually associated with a combo DSL modem/router setups an/or your ISP is blocking the ports. If you have this setup, the guide may not be helpful to you. If so you need to contact your ISP for help or possibly buy your own modem and separate router, so you can have access to your own router admin settings, that a DSL combo modem/router usually prohibits you from having access to.

Note: If you have a ADSL/cable all in 1 wireless or combo modem/router. Just plugging in a ethernet cable does not have the same result as bypassing the router on a normal setup. Because your router and modem are one unit so there is no way to bypass the router part of the unit to achieve a NAT type 1 connection.

Open [NAT 1]
The best experience, you can play/talk with all other gamers.

Moderate [NAT 2]
Better, but not ideal. You can play/talk to other gamers that have a NAT Status of Open and Moderate and no-one else.

Strict [NAT3]
This is the worst possible setup. You can play/talk to other gamers that have a NAT Status of Open and no-one else.