[tor-bugs] #19610 [Core Tor/Tor]: IPv6-only clients fetch microdescriptors from a small number of IPv6 fallbacks

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#19610: IPv6-only clients fetch microdescriptors from a small number of IPv6
fallbacks
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.8.4-rc
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, microdesc, fallbacks, tor-     |  Actual Points:
  client, network-health, user-enumeration,      |
  review-group-27                                |
Parent ID:  #23827                               |         Points:  1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 This is part of #23827 - we need to make sure the code doesn't use
 fallbacks when consensus method 27 is in use. The relevant commit is
 4ea838030a "Stop waiting for microdescs if the consensus supports IPv6
 ORPorts".

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19610#comment:15>
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