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NAT type: Open means anyone can join you.
NAT type: moderate means only certain people can join you.
In other words you want your nat type to be OPEN because it will make it easier for more people to join you.

oh k coz in mw2 forum there saying. u need nat type open.but when its Moderate i can't get host so i suppose there right

open = nothing blocking the updating or downloading for game setting and stuff so you can get host more often
moderated = something blocking the signal a port or anything it shall be harder for you to get host unless all the people in the game have moderated nat type