|Does not appear you read my link. You are not going to find answers if you close your thought processes.|
"NAT traversalOne solution for NAT traversal, called the Internet Gateway Device Protocol (IGD Protocol), is implemented via UPnP. Many routers and firewalls expose themselves as Internet Gateway Devices, allowing any local UPnP control point to perform a variety of actions, including retrieving the external IP address of the device, enumerate existing port mappings, and add or remove port mappings. By adding a port mapping, a UPnP controller behind the IGD can enable traversal of the IGD from an external address to an internal client."
Your last post doesn't even reflect your own statement in post #1
"Every game i have somehow manages to open the UDP ports it needs without me having to configure my router. "
So it is beyond the lan isn't it?
It appears to me you want to know how UPnP works which is why I suggested the UPnP forums.
You do understand this is not exclusive to UDP but also includes TCP?
Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's