I'm having trouble opening my NAT type even after forwarding ports. I followed the guide on PortForwarding.com and nothing changed.
-TP-Link TL-WDR3500 router (followed the TL-WDR4300 guide, but it should be the same)
-Xbox one has a static IP address
-Forwarded the following ports: 53, 80, 88, 500, 3074, 3544, 4500
-DMZ host is enabled for XBox IP
After testing multiplayer connection and checking my detailed network statistics, my detailed NAT information says "Your network is behind a port-symmetric NAT." Not really sure what to do next. Any help will be appreciated. Thanks.