[tor-bugs] #19990 [Core Tor/Tor]: EntryNodes is incompatible with IPv6-only bootstrap

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#19990: EntryNodes is incompatible with IPv6-only bootstrap
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal        |   Keywords:  ipv6
Actual Points:                |  Parent ID:
       Points:  2             |   Reviewer:
      Sponsor:                |
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 When UseMicrodescriptors is 1, tor clients which bootstrap over IPv6 have
 to get descriptors from the fallback directories, because there are no
 IPv6 addresses in the microdescriptor consensus.

 When EntryNodes is set, it excludes all the fallback directories, meaning
 that IPv6 clients can't bootstrap.

 This can be tested with:
 {{{
 src/or/tor DataDirectory /tmp/tor.$$ SOCKSPort 0 EntryNodes x
 ClientUseIPv4 0
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19990>
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