Here is a tutorial made by me
1.Get the iwnetserver
2. Place a folder called PC in your mw2 folder that should contain the playlists.ff file found here:
3.Edit the alteriwnet file with notepad, this file is the file located above the application
alteriwnet_configure application.. in it you change the server into server=HOST IP HERE , if u are the host u find your IP adress do this go to: run --> type cmd , then type ipconfig , your ip adress is the adress IPv4 there
3. Edit the iw4mp.cfg file with notepad and setting the values for enable_updates and enable_upload from 1 to 0.
4. Open IwNetServer.
5. Open Mw2.
6. Go to Dedicated Servers from AlteriW and type in the MW2 console connect IP.