Comment by MzHN
4 years ago
Does it work when both users have symmetric NAT with randomized ports?
WebRTC provides an abundance of hole punching, but as far as I've learned, nothing gets through symmetric NAT with randomized ports.
Except for relays (TURN), which isn't P2P.
A few weeks ago I tested a number of family phones using the online tools available and symmetric NAT was detected, some were very large UK mobile networks (Vodafone IIRC). That made me give up too.