[tor-bugs] #34129 [Circumvention/Snowflake]: Use STUN to determine NAT behaviour of peers

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#34129: Use STUN to determine NAT behaviour of peers
-------------------------------------+---------------------------
 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  enhancement              |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:  Sponsor28
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Comment (by cohosh):

 As mentioned in #34358, we don't have the libraries we need to implement
 this for our web-based proxies at the moment. Given that these far
 outnumber our standalone Go proxies, we might have to abandon this effort
 for the time being and rely on success-based heuristics to determine the
 proxy poll rate.

 We could still do some smarter matching here if we have the client
 determine their NAT type and have the proxies report to the broker their
 success rate. If the client has a restrictive NAT, the broker could match
 them up with a high-success-rate proxy.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34129#comment:13>
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