[tor-bugs] #30368 [Circumvention/Snowflake]: Run some tests to check reachability of snowflake proxies

[Tor Bug Tracker & Wiki]

#30368: Run some tests to check reachability of snowflake proxies
-------------------------------------+--------------------------
 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  task                     |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
-------------------------------------+--------------------------

Comment (by cohosh):

 Starting this afternoon (it may have been happening before but I was
 unaware), access to `stun.l.google.com:19302` was blocked.

 Simply changing the client line to use
 {{{-ice stun:stunserver.org}}}
 resulted in a full bootstrap.

 I'm going to refine the snowflake tests to tell us more information about
 precisely where the blocking is occurring because this appears to be
 changing. The candidates for blocking I can think of are:
 - At the ICE Gathering stage (the connection to the client's STUN server)*
 - At the signaling stage (the connection to the domain-fronted broker)
 - At the Connectivity checking stage (the UDP connection to the snowflake
 proxy)*
 - At the connected stage (the TCP connection to the snowflake proxy)

 The stages with asterisks (*) are where we've seen blocking occur so far

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30368#comment:9>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online