[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
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 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):

 Replying to [ticket:34129 cohosh]:
 > - are there public STUN servers that support this feature?

 I just modified the pion/stun library to check for this attribute tested
 it against
 [https://gist.github.com/mondain/b0ec1cf5f60ae726202e#gistcomment-3238034
 this list] of public STUN servers. 17 of them support RFC 5780, including
 `stun.voip.blackberry.com` and `stun.voipgate.com` which judging by their
 names might correspond to existing VoIP applications and so might be good
 candidates for #30579 anyway.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34129#comment:5>
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