4 ms·

It eliminates NAT traversal for peers that are also IPv6. I think the most relevant consumer usecase is probably gaming.

• tsimionescu 5y ago
  Well, you still need firewall traversal, so you still can't do peer-to-peer connections, something still needs to allow you to punch a hole in the firewall. The only advantage that IPv6 with public IPs behind a firewall has compared to NAT is that each host can use the same port behind the firewall, you don't need a unique port for each host. I don't see this as a major advantage for an end-user (though it is helpful for large internal networks).
  • zajio1am 5y ago
    Firewall traversal for mediated PtP through basic stateful firewalls is simple - both sides start sending UDP packets to each other and outgoing packets open hole in firewall for incoming packets. The same approach does not work reliably with NAT, mainly because you do not know translated port numbers. It also may fail if both sides are behind the same NAT, as NAT pinning is sometimes not implemented.
    • fomine3 5y ago
      So is UDP hole punching the only modern way to traverse firewall?
      • can16358p 5y ago
        Which is a very hacky way. I wouldn't rely on it for anything serious as it might break at any time.
        • zajio1am 5y ago
          Why? It seems like simple, reliable and trivial. It is not hacky, it is essentially how stateful outgoing-only firewall is supposed to work for UDP.