[metrics-bugs] #22309 [Metrics/Analysis]: How many relays change IP addresses a lot and also get the Guard flag?

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#22309: How many relays change IP addresses a lot and also get the Guard flag?
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 Reporter:  arma              |          Owner:  metrics-team
     Type:  task              |         Status:  new
 Priority:  Medium            |      Milestone:
Component:  Metrics/Analysis  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:                    |  Actual Points:
Parent ID:  #22308            |         Points:
 Reviewer:                    |        Sponsor:
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Comment (by cypherpunks):

 I looked at one month of data (2017-03) and found 78 guard relays which
 changed their IP at least once.

 I hope you are not punishing guards for changing their IP by resting their
 reputation, because:
 - attackers can keep the same IP address (making this safeguard
 ineffective)
 - this would negate the protection operators get by running in
 OfflineMasterKey mode

 More detailed data:
 https://gist.github.com/nusenu/bebbc230de7cab6a89f122d2d02c6ab6

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22309#comment:1>
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