[tor-bugs] #20916 [Core Tor/Tor]: Inconsistent IPv6 address between consensus and microdescriptor

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#20916: Inconsistent IPv6 address between consensus and microdescriptor
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.1.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  needs-proposal, ipv6, regression,    |  Actual Points:
  triage-out-030-201612                          |
Parent ID:                                       |         Points:  1
 Reviewer:                                       |        Sponsor:
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Changes (by teor):

 * keywords:  ipv6, regression, triage-out-030-201612 => needs-proposal,
     ipv6, regression, triage-out-030-201612
 * owner:   => teor
 * status:  new => assigned


Comment:

 This also makes it easier for IPv6 clients to bootstrap, and makes happy-
 eyeballs-style IPv6 detection possible.

 We'll need a short proposal for this explaining why it will work (and why
 it gets better once we have consensus diffs).

 One decision will be:
 * do we move IPv6 addresses from the microdesc to microconsensus in one
 consensus method?
  * (clients will be fine, back to 0.2.8 where we made IPv6 from the
 consensus work)
 * or, do we have one method to add them to the microconsensus, and another
 to remove them from the microdesc in a later release?

 (The staged option seems much more sensible, but maybe we could make them
 N & N+1 in the same release, in case we need to run with both for a while
 due to an unexpected bug.)

 Some tools and external code might need to adapt. But much external code
 uses the full consensus anyway.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20916#comment:4>
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