[tor-bugs] #29570 [Core Tor/Tor]: Enforce mutually exclusive logic for IPv6 ORPort flags

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#29570: Enforce mutually exclusive logic for IPv6 ORPort flags
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 Reporter:  s7r                                  |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  unspecified
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, ipv6, reachability,       |  Actual Points:
  needs-proposal                                 |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by neel):

 Replying to [comment:9 teor]:
 > Allowing an IPv4 and an IPv6 advertised address to redirect to the same
 underlying port:
 > * makes 1 and 2 better for a few relays
 > * makes 3, 4, and 5 slightly worse, all over the network
 >
 > Rejecting this rare case:
 > * makes 1 and 2 worse for a few relays
 > * makes 3, 4, and 5 slightly better, all over the network
 > * makes 6 a tiny bit worse, because it requires a little bit of extra
 code and documentation

 I would also reject this case (redirecting IPv6 to IPv4).

 It adds unnecessary complexity to the Tor code and network setup to be
 worth it. (At least in my opinion) the costs would be more than the
 benefits.

 Why not just listen on IPv6 as well instead of giving "IPv6" which is
 really a tunneled IPv4 socket?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29570#comment:11>
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