[tor-bugs] #15463 [Tor]: Tor deals poorly with a very large number of incoming connection requests.

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#15463: Tor deals poorly with a very large number of incoming connection requests.
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     Reporter:  alberto   |      Owner:
         Type:  defect    |     Status:  new
     Priority:  critical  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor       |    Version:  Tor: 0.2.5.11
   Resolution:            |   Keywords:  tor-hs SponsorR SponsorZ
Actual Points:            |  Parent ID:
       Points:            |
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Comment (by arma):

 Replying to [comment:15 asn]:
 > Can we figure out whether such volume of `INTRODUCE1` cells is possible
 without #15515? If the attacker is not using #15515, and the IP can handle
 that many circuits, why can't our hidden service also handle them?
 > [...] on the first logs, the HS had 3 IPs. The first IP sent us 11k
 `INTRODUCE2` cells, the second 3.5k `INTRODUCE2` cells, and the last only
 200. Similarly, on the last logs the first IP sent 6k `INTRODUCE2` cells,
 the second 3k `INTRODUCE2` cells and the last about 50. What I'm trying to
 say here friends is that the distribution is not uniform as would be
 expected by a normal client, and also the two distributions are quite
 similar.

 Another explanation (alas) might be that each of the main two intro points
 here had different capacity to handle incoming requests, so they each got
 saturated at a different level.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15463#comment:16>
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