[tor-bugs] #15513 [Tor]: Investigate lifetime of IPs on Hidden Services

[Tor Bug Tracker & Wiki]

#15513: Investigate lifetime of IPs on Hidden Services
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     Reporter:  donncha      |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:  tor-hs
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by asn):

 Some correctness analysis (based on the newest graphs and comment:10):

 - It seems that introduction points have the intended lifetime, which is a
 random lifetime between 18 and 24 hours. Looking at the first graph we can
 see that about 75% of the intro points of the three normal hidden services
 indeed stay up for more than 18 hours.

   We can see that the hidden wiki hidden service has lower lifetimes for
 its intro points. I think that's because of the intro point formula
 (#4862). For example, say that the HS has 9 intro points and then it gets
 less traffic and wants to go down to 5 intro points; in that case, the HS
 will discard 4 IPs which makes it look like they have a very short
 lifetime.

 - Our measurement period was 25 days, and looking at the last graph, we
 see that the normal hidden services have cycled through about 100 relays
 as IPs. This appears to be normal assuming an average lifetime of 20 hours
 for each IP, and 3 IPs per HS. The hidden wiki saw about 300 relays as IPs
 because of #4862.

   This means that about 100 relays had the chance to measure the
 popularity of those HSes.

 - We can see that even normal HSes will publish more than 2 descriptors
 per hour about 15% of the time. I assume this happens because the
 descriptor was marked as dirty because an intro point died or something.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15513#comment:15>
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