Your NAT type is basically how your internet performs over Xbox live. You can try getting your family to not use electronic devices that put strain on the internet when you're playing MW2 or just get fibreoptic internet. Infact, what I do which is very effective, is have my wireless router right next to my xbox which I can directly plug in - it makes the internet very fast.
mine is open or moderate however, when my internet is 'lagging' its strict, i dunno what this is, please help.
You need to access the settings on your router.
You have to change your NAT type through your router. Call your internet provider for instructions
Test your xbox live connection in network settings and your nat type is open
It has all got to do with your NAT Type. If your NAT Type is Open then it is using WiFi. If your NAT Type is Strict then it is using your Internet Connection.
by changing it
Im not exactly sure but I think you can go to Private match and change it there.
Just type in mw2 hacks on google and there will be lots of websites with hacks.
Its different depending on what modem or router you have, check the xbox website for a list of different modem models and to see instructions on how to change the NAT type of your modem. It should be easy to follow as its Microsoft's own guide. http://www.xboxlivetheguide.co.uk/XBoxLiveTheGuide3.php?title=My%20NAT%20Setting%20is%20Strict/Moderate%20what%20can%20I%20do Try this link, they give instructions to change the NAT type of various popular modems. Hope this helped.
Stealth
YES YOU CAN FOR ALL YOU PEOPLE WHO HAVE A STRICT NAT ON MW2 OR HALO 3. What you need to do is to go onto 192.168.1.1 and go to port forwarding and use the ports 88 with udp and port 3074 with tcp/udp. after saving them you will be able to have possible a open NAT for mw2 or if it doesnt in most cases it will allow you to get into matches faster.
u cant