[tor-bugs] #4147 [Analysis]: What fraction of exit relays exit from a different IP than is in their descriptor?

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#4147: What fraction of exit relays exit from a different IP than is in their
descriptor?
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 Reporter:  arma      |          Owner:     
     Type:  task      |         Status:  new
 Priority:  normal    |      Milestone:     
Component:  Analysis  |        Version:     
 Keywords:            |         Parent:     
   Points:            |   Actualpoints:     
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Comment(by karsten):

 "Roughly 15%" is the answer.

 Here's what I did:

 First, I looked at the consensuses from two weeks in February 2012 to find
 all relays that got the Exit flag assigned.  Second, I summed up the bytes
 they wrote in the hour after the consensuses' valid-after time.  Third, I
 looked at the exit lists to see if the relay was found to exit via a
 different address than the relay used as OR address.  If there was only a
 single exit address the day before the consensuses' valid-after time that
 was different from the OR address, I counted the written bytes as
 potentially using a different address for exiting.

 Here's the result:

 [[Image(ticket:4147:different-exit-address.png)]]

 The parsing and graphing code is available [https://gitweb.torproject.org
 /metrics-tasks.git/tree/HEAD:/task-4147 here].

 Does that answer the question?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4147#comment:2>
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