[tor-bugs] #20996 [Core Tor/Tor]: IPv6-only client fails to bootstrap on microdescriptor fetch/fallback

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#20996: IPv6-only client fails to bootstrap on microdescriptor fetch/fallback
---------------------------+------------------------------------
 Reporter:  mtigas         |          Owner:
     Type:  defect         |         Status:  needs_review
 Priority:  Medium         |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor   |        Version:  Tor: 0.2.8.5-rc
 Severity:  Normal         |     Resolution:
 Keywords:  ipv6 fallback  |  Actual Points:
Parent ID:                 |         Points:  0.5
 Reviewer:                 |        Sponsor:
---------------------------+------------------------------------
Changes (by teor):

 * status:  new => needs_review
 * keywords:  ipv6 => ipv6 fallback
 * version:  Tor: 0.2.9.7-rc => Tor: 0.2.8.5-rc
 * points:   => 0.5
 * milestone:   => Tor: 0.3.0.x-final


Comment:

 Thanks mtigas!
 The previous bug is #19608, where I tried to fix it this issue in 0.2.8.

 Please see my branch ipv6-only-client, which fixes this issue.
 Would you like to test it?

 I tested it with the chutney IPv6-only networks hs-ipv6, single-onion-
 ipv6, and client-ipv6-only, with Use Microdescriptors turned on (the
 default). These work on any machine with IPv6 localhost.

 I also tested it using the command-line:
 {{{
 src/or/tor ClientUseIPv4 0 DataDirectory `mktemp -d`
 }}}
 This only works on an IPv6-capable machine.

 We can add a test for this issue to chutney once #21000 is done, that work
 is tracked in #21001.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20996#comment:1>
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