[tor-bugs] #24902 [Core Tor/Tor]: Denial of Service mitigation subsystem

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#24902: Denial of Service mitigation subsystem
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 Reporter:  dgoulet                              |          Owner:  dgoulet
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ddos, tor-relay, review-group-30,    |  Actual Points:
  029-backport, 031-backport, 032-backport       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by dgoulet):

 Just did an experiment with a tor2web client with my relay pinned as the
 RP. Because it is the only RP available, the tor client happily retries
 *non* stop to connect to a working RP until the `SocksTimeout` that is 120
 seconds by default. In this case, it creates many circuits to the same RP.

 I think Roger opened a ticket recently about making tor client try to
 remember failing relays for specific things.

 So just keep in mind that we'll have a _lot_ of tor2web clients trying
 every relays on the network if this defense becomes a thing everywhere.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24902#comment:23>
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