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So when you're in the "lucky" situation that your XBox One states "NAT Strict" or "NAT Moderate", you might run into problems when playing a game multiplayer - especially when you host the game.
To get this to work, even with NAT Strict, you'll have to do some port forwarding settings in your modem or router.
First of all; I recommend giving your XBox One a fixed IP address.
This can be done in two ways.
The first method involves your router being capable of assigning IP addresses to a MAC address in the DHCP settings. Note that not all modems/routers can actually do this. But if you modem can; do so!
The second method involves doing manual IP settings in your XBox One.
Go to Preferences -> Network -> Advanced Settings -> IP Settings -> Manual.
Enter a fixed IP address here, and for DNS and Gateway use the IP address of your router or modem.
Next step is to map certain ports to your XBox One's IP address - this is done in your router or modem.
These are the ports you will need:
