[tor-bugs] #20216 [Metrics/Censorship analysis]: Iran blocking of direct users, 2016-08 and 2016-09

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#20216: Iran blocking of direct users, 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                       |     Resolution:
 Keywords:  censorship block             |  Actual Points:
Parent ID:                               |         Points:
 Reviewer:                               |        Sponsor:
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Comment (by joss):

 It does seem odd behaviour.

 The drop in ofs3 usage corresponds to a small decrease in the baseline
 number, but doesn't really change that much. I'm more interested in why
 the obsf4 spike was so short-lived. It looks like a clear response to the
 massive drop in direct usage, but doesn't last when direct usage falls to
 zero.

 I wonder if this is some kind of doubled event. An initial block on direct
 usage, followed by a minor relaxation in which the direct usage climbed
 again while bridge usage fell, followed by a second block.

 Do we have an AS-level breakdown of connections?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20216#comment:8>
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