Resolving PS5 NAT Type Issue on OpenWRT

I recently upgraded my router to OpenWRT and set up a dynamic public IP address. The UPnP feature is enabled, and I can successfully connect to my PS5's IP address. However, the PS5's NAT type remains stuck on NAT2. To resolve this issue, I need to make some further adjustments to my OpenWRT configuration. After conducting extensive research and experimentation, I have uncovered a few potential solutions.

Firstly, it is essential to ensure that the implicit NAT rule is disabled in the OpenWRT firewall. This can be achieved by navigating to the firewall settings and selecting 'Custom rules.' Then, disable the 'Implicit NAT' option.

Another crucial step is to configure the port-forwarding rules on the OpenWRT router. In the 'Services' section, select 'Port forwarding' and set up a rule that directs incoming traffic on port 500-599 to the PS5's IP address. This will allow the PS5 to communicate with other devices and services on the internet without being restricted by the router's NAT type.

In addition to the above steps, it is also recommended to enable the 'Full Cone NAT' feature in the OpenWRT settings. This can be done by navigating to the 'NAT' section and selecting the 'Full Cone NAT' option. This will allow the PS5 to maintain a consistent NAT type by providing a more accurate and precise mapping of its internal IP address to the external IP address.

By implementing the aforementioned changes, I was able to successfully resolve the PS5 NAT type issue on my OpenWRT router. The NAT type changed from NAT2 to NAT1, allowing me to enjoy a seamless gaming experience with my PS5 and other online-enabled devices.