[tor-bugs] #17281 [Tor]: Make IPv6-only clients work and bootstrap

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#17281: Make IPv6-only clients work and bootstrap
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 Reporter:  nickm            |          Owner:  teor
     Type:  defect           |         Status:  accepted
 Priority:  High             |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor              |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  ipv6 028-triage  |  Actual Points:
Parent ID:  #17811           |         Points:  medium/large
  Sponsor:                   |
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Changes (by teor):

 * status:  new => accepted
 * owner:   => teor


Comment:

 I wonder how much of this works already?

 Clearly, we need at least some authorities or fallback directories with
 hard-coded IPv6 addresses (#17327), otherwise an IPv6-only client has no
 hope of bootstrapping.

 I'm not sure if we need to fix reachable addresses (#9067), unless it
 denies all IPv6 directory or OR addresses by default (#9068).

 I'm not sure if clients already use whatever addresses they can bootstrap
 and OR over (#17217), or if they always choose IPv4 addresses. Will I need
 to set ClientPreferIPv6ORPort or ClientPreferIPv6DirPort (#17834)?

 I suspect that if we don't listen on IPv6 by default on the SOCKSPort
 (#11360), then this will be a show-stopper, but only after the client is
 connected to the Tor network.

 I'll be doing my testing with a client build with:
   * The latest patch for authority IPv6 addresses (#17327)
   * ClientIPv6 1 set

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17281#comment:6>
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