AT&T customers can improve their NAT type by opening specific ports. Here's how:
1. Log in to your router's administrative interface. This is usually done by entering 192.168.1.254 into your web browser's address bar.
2. Locate the port forwarding section of the router interface. This is typically under a heading like Applications & Gaming, Advanced or Port Forwarding/NAT.
3. Create a new port forwarding rule for each of the following ports, using the IP address of your Xbox One console:
• 53 (UDP)
• 80 (TCP)
• 3074 (UDP and TCP)
4. Save your changes and restart your console