[tor-bugs] #27491 [Core Tor/Tor]: Prefer IPv4 or IPv6 based on the number of failures

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#27491: Prefer IPv4 or IPv6 based on the number of failures
------------------------------+----------------------
     Reporter:  neel          |      Owner:  neel
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:  #17385
      Sponsor:                |
------------------------------+----------------------
 Suggested by teor at #17385:

 > 3. If the machine instantly fails IPv4 or IPv6 connections, stop those
 connections for a while
 > 4. When there are a lot more IPv4 than IPv6 failures, don't try IPv4 as
 much
 > 5. When there are a lot more IPv6 than IPv4 failures, don't try IPv6 as
 much
 > 6. After a while, forget old failures

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27491>
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