Afaik you need some external resource to coordinate the punch. The STUN protocol is purpose built for this, and both clients need to be able to reach a STUN server to coordinate which port and public IP they’ll try to connect to each other on. I assume this does something similar but with p2p network tech instead of a STUN server.

Same as it ever was

So do we get to pick which Doom-esque demon hybrid we become or is it assigned for us?

Sir this is a Wendy’s

Maybe we interpreted this article differently, but Anthony Comstock was the narrow minded prude that campaigned to make it illegal?