NAT ratings?

im new to the halo world and im trying to play campaign and matchmaking over xbox live with my friends but i cant because my NAT rating is only moderate, how do i change it to closed?

I don’t know much about NAT, but I do know you should try to get it open not closed.
Hopefully someone will reply with a way to change it.

Although it may present a somewhat complicated and laborious solution, the following guide outlines the most efficient resolution to NAT issues. Having employed this guide on multiple occasions, I can testify to its usefulness. I wish you the best of luck in attempting to attain an open NAT type.

your nat is your modem settings, if you close it, you only restrict yourself to playing with worse people whom have closed nats aswell… You can go to Portforward.com they will instruct you how to properly OPEN your nat. If you truly wish to restrict yourself and find games more slowly, im sure you can dig into it…

EDIT: ^ dig into it refers to making a restricted nat… i never want a closed nat and dont understand why you would…

now if you want to make your PARTY private, go to the right menu where friends pop up and scroll to top, select the menu interface and from there u can control the amount of people that join; also how they are allowed to join, friends only / invite only