[tor-bugs] #15775 [Tor]: Add IPv4 Fallback Directory List to tor, active by default

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#15775: Add IPv4 Fallback Directory List to tor, active by default
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 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:  closed
 Priority:  High                                 |      Milestone:  Tor:
Component:  Tor                                  |  0.2.8.x-final
 Severity:  Major                                |        Version:  Tor:
 Keywords:  0.2.8.x-triage, tor-dist,            |  0.2.4.7-alpha
  027-triaged-1-in, DoS, SponsorU, 028-triaged,  |     Resolution:  fixed
  TorCoreTeam201512,  MikePerry201512R           |  Actual Points:  20
Parent ID:  #17158                               |         Points:
  Sponsor:  SponsorU                             |  medium/large
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Changes (by teor):

 * status:  needs_review => closed
 * resolution:   => fixed
 * parent:  #15228 => #17158


Comment:

 With #17327 and #15775 merged, we can now run an opt-in fallback
 directories trial in #17158. We can generate a list of fallbacks for each
 release using scripts/maint/updateFallbackDirs.py and the
 whitelist/blacklist from that trial.

 (Clients will use IPv4 fallbacks immediately, but they won't use IPv6
 authorities or fallbacks until #17840 is implemented.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15775#comment:61>
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