[tor-bugs] #23870 [Core Tor/Tor]: Authorities: document what happens when relays have misconfigured IPv6 (was: Authorities: When relays have misconfigured IPv6, mark them as running and IPv4 only)

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#23870: Authorities: document what happens when relays have misconfigured IPv6
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 Reporter:  teor          |          Owner:  (none)
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.3.3.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  ipv6, doc     |  Actual Points:  0.1
Parent ID:  #20916        |         Points:  0.2
 Reviewer:                |        Sponsor:
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Changes (by teor):

 * keywords:  needs-proposal, ipv6, regression => ipv6, doc


Old description:

> Otherwise, we lose useful relays when authorities set
> AuthDirHasIPv6Connectivity.

New description:

 ~~~Otherwise, we lose useful relays when authorities set
 AuthDirHasIPv6Connectivity.~~~

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Comment:

 I spoke with the directory authority operators about this, and they are
 happy with the existing behaviour. But we need to document it:
 * if no voting authorities set AuthDirHasIPv6Connectivity, there will be
 no IPv6 addresses in the consensus
 * if a minority of voting authorities set AuthDirHasIPv6Connectivity,
 relays with unreachable IPv6 addresses will have those addresses removed
 from the consensus
 * if a majority of voting authorities set AuthDirHasIPv6Connectivity,
 relays with unreachable IPv6 addresses will not be listed as running

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23870#comment:1>
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