NAT type keeps changing from open to moderate

your nat type can change from open to moderate or strict it is very annoying mine dose it all the time but open is the best nat type to have.

My NAT type is open, which is why in confused.

Unless I should change it from open to moderate?

That should work if settings are any similar to the Pace 5031NV from uverse. Also i work for uverse tech support so im obviously very familiar with the equipment. Lol

In the settings for the Pace Gateway you will want to put the dlink into DMZ+ mode from the pace gateway. Should be Settings>Firewall>Apllications,Pinholes,and DMZ.

from there you should have an option where it has you select which device that you want to set a firewall rule for.

( NOTE: this will be by device name/ Hostname of the device.which sometimes might be something like 'UnknownCE774' or something similar... This is if the gateway cannot detect a hostname. So it replaces it with a hostname of unknown<device mac address>)

So choose whichever that device is for you and the you should have a 'bubble' that you can select which says 'Allow all applications (DMZ+).

Then hit save.

This will essentially bypass all the traffic going to your dlink from hitting the Pace Gateways firewall.

From their on your dlink you would just set up whatever settings you need in the dlink such as port forwarding or UpNp

You have a double router situation and now are double NAT'ing, you have a hidden NAT from the XBox point of view. Put the D-Link into a DMZ on the PACE or set the PACE to a bridge mode.

Pace 5168N - sort of related to the 2Wire/Pace 5031NV