I recently purchased a E2000 router and had open vpn installed on it. Now I'm having an issue with limited internet connectivity on my XBOX. It is saying because of my router setting the NAT type is moderate. I contacted Strong VPN and they said it was a router issue and for me to contact Sabai.
I am happy to help you.
You will need to log into the router control panel by entering 192.168.199.1 in the address bar of your web browser.
Then, click on Advanced/Port Forwarding/UPnP/NAT-PMP and enable both options. If that does not resolve the issue then you may need to forward some ports.
Here is the information on the ports that need forwarding.
There are examples on the screen if you need assistance. http://support.xbox.com/en-US/xbox-live/connecting/network-ports-used-xbox-live