[tor-bugs] #33819 [Core Tor/Tor]: Make clients and bridges send IPv6 extends by default in Tor 0.4.5

[Tor Bug Tracker & Wiki]

#33819: Make clients and bridges send IPv6 extends by default in Tor 0.4.5
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     Reporter:  teor           |      Owner:  (none)
         Type:  task           |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.4.5.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  ipv6, prop311, 045-should
Actual Points:                 |  Parent ID:  #33220
       Points:  1              |   Reviewer:
      Sponsor:  Sponsor55-can  |
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 If #33818 is included in Tor 0.4.4, the relays will send IPv6 extends by
 default. But clients and bridges won't, for anonymity reasons.

 By the time 0.4.5 is released, a large number of clients and bridges will
 be on 0.4.4. So it will be safe for clients and bridge to send IPv6
 extends.

 Here's what we need to do to change the default:
 * set `ExtendByIPv6ORPort=1` in the consensus, and
 * set `ExtendByIPv6ORPort 1` as the default in Tor.

 To avoid confusion, clients and bridges will send IPv6 extends, but they
 won't initiate outbound IPv6 connections to relays. For more details, see
 #33818 and ExtendAllowIPv6Addresses.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33819>
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