> With IPv6 you already know your address and just give it to the peer you are communicating with. You then tell your firewall to allow connections from the add

> With IPv6 you already know your address and just give it to the peer you are communicating with. You then tell your firewall to allow connections from the address(:port) that the peer tells you. No STUN, no TURN, no ICE. What about phone networks? (in the US providers block all incoming traffic.) Or other ISPs that block incoming traffic? NAT has been used to address a fundamental problem of what traffic can be trusted. That's what Tailscale fixes.