But you can open a large range of ports to multiple devices. For a game console you can allow UDP 1024-65535 without issue. And if you have multiple devices t

But you can open a large range of ports to multiple devices. For a game console you can allow UDP 1024-65535 without issue. And if you have multiple devices that use the same port you can open that port on each one. No need for an external server to look up what port the device can be reached on.