How to make your NAT type open on MW3?

Do it the smart way, call xbox , 1 800 4my xbox , tell them u want to open your nat type, and they will walk you threw it

plz watch my vid

https://www.youtube.com/user/ANG3LICWARR1OR/videos

*If you want to Open the NAT its very easy some times Even I get Pissed off about this hers the steps

This is how mine's setup, and it works flawlessly, NAT type "open"

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1. Disable DHCP, UPnP, and DMZ in your router. Make sure NAT is enabled.

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2. You need to set astatic IP for your PC. There's a guide on how to do this at Portforward.com configuring a static IP. Which is all well and good, but there's an awful lot of pointless junk in it. You don't need to open CMD for one thing, it's easier (and less daunting to the average user) to login to your router and get the info it would give you from there.

Make a note of your "Domain Name Server" IP addresses, these are the DNS numbers you'll want to put in the following section.

Make a note of your Router's IP address, also known as the "Default Gateway".

Now, using the guide for Windows 7 as an example, you want to open your Network and Sharing centre (right click network icon in the toolbar, select "Open Network and Sharing Center", then follow the portforward guide from step 7. Pay special attention to step 10:

3. Forward ports through your router. Now the guide at portforward I haven't used for MW2. In fact I haven't forwarded any ports specifically for MW2. I do however have the CoD4 ports forwarded, so use the CoD4 guide, and do the port range 28960-29000 for both UDP and TCP. When it asks which server you want to forward the connection to, that will be your PC's IP address

Note that the above range doesn't even include the ports that portforward.com suggest (27014-27050, these aren't for MW2, but for Steam), but I've got an open NAT, and if you're reading this you probably haven't. In fact I don't even have them ports open for anything else either. I never forwarded any ports for MW2, or CoD:WaW either. The portforwarding rules for CoD4 have them both covered. So use the CoD4 guide, and forward the above ports for both directions

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Now if you've done all this correctly you should have an open NAT. If not, carry on reading:

4. Make sure iw4mp.iw4sp.exe's are allowed through your firewall. Depending on your firewall you may also have to forward the ports through it, do the same ports as you have in your router, again for both UDP and TCP (you want traffic to go both ways).

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5. Still having trouble? Make sure your antivirus software isn't blocking the game from accessing the web. You'll need to go into the AV advanced settings and add iw4mp/iw4sp.exe's to your exceptions, so that your antivirus just ignores them.