This is a simple and easy way to change your NAT settings to open. First, open the command prompt. Type ipconfig, and then look for an IP next to default gateway. Make sure that you remember it. Type that IP in your browser. Enter your router information. Go to the administration tab, and enable UPnP. If you did this right your NAT settings should be open. You will see a significant change. You will be able to join and play games easier, and matches will be made quicker. This is a very easy process for changing your NAT settings to open.