[tor-bugs] #15235 [Tor]: Identify the state of IPv6 support in Tor

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#15235: Identify the state of IPv6 support in Tor
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:
     Type:  task                                 |         Status:
 Priority:  Medium                               |  assigned
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.8.x-final
 Keywords:  tor-client, tor-relay, ipv6,         |        Version:
  research, 027-triaged-1-out                    |     Resolution:
Parent ID:                                       |  Actual Points:
  Sponsor:                                       |         Points:  medium
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Comment (by teor):

 As of #17840, clients can bootstrap by setting:
 * ClientUseIPv4 0 (IPv6-only) or
 * ClientUseIPv6 1 and ClientPreferIPv6DirPort 1 and ClientPreferIPv6ORPort
 1 (dual-stack).

 In addition to the 4 authorities on IPv6, clients on IPv6 will use the 20%
 of fallback directories with IPv6 addresses to bootstrap.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15235#comment:8>
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