NAT-PMP Security Vulnerability Affects 1.2M Routers
If a mapping already exists for a given internal address and port (whether that mapping was created explicitly using NAT-PMP, implicitly as a result of an outgoing TCP SYN packet, or manually by a human administrator) and that client requests another mapping for the same internal port (possibly requesting a different external port), then the Universal Plug and Play (UPnP) | AT&T Community Forums Feb 04, 2017 How to Turn Off NAT-PMP on Airport Routers from macOS
May 02, 2011
Services — UPnP & NAT-PMP | pfSense Documentation
The third option, port forwarding, is explained in the next topic. Setting up manual port forwarding without UPnP/NAT-PMP. If your networking devices don't support UPnP or NAT-PMP or you have a double-NAT network and cannot use any of the other options to resolve the issue, you may need to use "port forwarding" to allow incoming connections.
Configuring UPnP and NAT-PMP¶. UPnP is short for Universal Plug and Play and is commonly found on Windows, BSD and Linux systems.. NAT-PMP is short for NAT Port Mapping Protocol and is similar to UPnP but found more commonly on Apple devices and programs.. A growing number of programs support both methods. pfSense® software supports both, and the service may be configured at …