#20216: Iran blocking of vanilla and obfs3, 2016-08 and 2016-09
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     Reporter:  dcf                          |      Owner:
         Type:  defect                       |     Status:  new
     Priority:  Medium                       |  Milestone:
    Component:  Metrics/Censorship analysis  |    Version:
     Severity:  Normal                       |   Keywords:  censorship
                                             |  block
Actual Points:                               |  Parent ID:
       Points:                               |   Reviewer:
      Sponsor:                               |
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 Direct users in Iran dropped from 8,000 to 2,000 between 2016-08-20 and
 2016-08-23. The numbers recovered to 4,000, then crashed to 400 on
 2016-09-03 and 2016-09-04.
   [[Image(userstats-relay-country-ir-2016-06-24-2016-09-22-off.png)]]
 [https://metrics.torproject.org/userstats-relay-
 country.html?start=2016-06-24&end=2016-09-22&country=ir&events=off link]

 Looking at bridge users, there is an increase right around 2016-08-20, the
 time of the first blocking, then an abrupt return to previous levels
 around 2016-09-03, the time of the second blocking.
   [[Image(userstats-bridge-combined-ir-2016-06-24-2016-09-22.png)]]
 [https://metrics.torproject.org/userstats-bridge-
 country.html?start=2016-06-24&end=2016-09-22&country=ir link]

 Looking at the graph of bridge users by transport, obfs4 continued working
 while obfs3 and vanilla were blocked.
   [[Image(userstats-bridge-country-ir-2016-06-24-2016-09-22.png)]]
 [https://metrics.torproject.org/userstats-bridge-
 combined.html?start=2016-06-24&end=2016-09-22&country=ir link]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20216>
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