One comment on “Am I behind a Symmetric NAT?

  1. As you point out the cost of symmetric NAT (at BOTH the ends) is the requirement of a TURN. At various times, people have proposed different ways to avoid use of a relay server. For example, https://tools.ietf.org/id/draft-takeda-symmetric-nat-traversal-00.txt proposes some heuristics to predict the rule the NAT uses for port mapping, thereby avoiding use of a relay. Like wise https://tools.ietf.org/html/rfc5780 suggests some other scheme.

    As far as I know, these efforts didn’t get much traction possibly because most are service providers and they see other benefits in routing the traffic through their infrastructure.

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