[tor-bugs] #33221 [Core Tor/Tor]: Prop 311: 4. Check Relay and Bridge IPv6 ORPort Reachability

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#33221: Prop 311: 4. Check Relay and Bridge IPv6 ORPort Reachability
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     Reporter:  teor            |      Owner:  teor
         Type:  task            |     Status:  assigned
     Priority:  Medium          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  ipv6, prop311
Actual Points:                  |  Parent ID:  #33048
       Points:                  |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 This is a parent ticket.

 We propose that relays (and bridges) check their own IPv6 ORPort
 reachability.

 To check IPv6 ORPort reachability, relays (and bridges) extend circuits
 via
 other relays (but not other bridges), and back to their own IPv6 ORPort.

 If IPv6 reachability checks fail, relays (and bridges) should refuse to
 publish their descriptors, if they believe IPv6 reachability checks are
 reliable, and their IPv6 address was explicitly configured. (See
 [Proposal 312: Relay Auto IPv6 Address] for the ways relays can guess
 their
 IPv6 addresses.)

 Directory authorities always publish their descriptors.

 From Proposal 311, section 4:
 https://gitweb.torproject.org/torspec.git/tree/proposals/311-relay-
 ipv6-reachability.txt#n246

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33221>
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