[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:  needs_information
     Priority:  major        |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor          |    Version:  Tor: 0.2.4.7-alpha
   Resolution:               |   Keywords:  tor-dist, 027-triaged-1-in
Actual Points:               |  Parent ID:  #15228
       Points:               |
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Comment (by teor):

 Possible opt-out mechanisms:
 * Manual: operator contacts tor-relays, relay key is added to exclusion
 list (not yet implemented)
 * Automated: operator configures relay to disable DirPort

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15775#comment:28>
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