[tor-bugs] #29641 [Applications/Tor Browser]: Tor Browser fails to bootstrap on IPv6-only access networks

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#29641: Tor Browser fails to bootstrap on IPv6-only access networks
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 Reporter:  jeremyvisser              |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:                            |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by teor):

 Replying to [comment:2 gk]:
 > Replying to [comment:1 teor]:
 > > Tor does have a set of hard-coded IPv6 directory servers, but they're
 not on by default.
 > >
 > > There are a few ways for us to fix this issue permanently:
 > >
 > > * Tor Browser can learn to auto-detect IPv6-only networks, and set the
 appropriate options. Or it can add a Tor Launcher option that says "I am
 on an IPv6-only network". OnionBrowser uses this strategy.
 >
 > I'd like to avoid that workaround if possible and get this fixed in tor
 land. teor: what would be a good tor ticket for the `tbb-needs` keyword?

 #17835, with a note saying that you need Tor to work on IPv4, IPv6, and
 dual-stack networks without extra configuration.
 (We won't do all the child tickets - they are ideas that we can try if we
 need to.)
 You could say that you're trialling ClientAutoIPv6ORPort.

 Replying to [comment:3 gk]:
 > Replying to [comment:1 teor]:
 > > * tor can learn to connect over IPv4 and IPv6, and use whichever one
 works. We have an experimental "ClientAutoIPv6ORPort" option in our alpha
 versions. But we're not sure if it will trigger other bugs. (For example,
 the guard code stops using guards when there are too many failures.) It
 needs more testing.
 >
 > I am fine setting that in the alpha series if you think that would be
 helpful to shake out bugs on tor's side. What's the tor ticket
 implementing that option?

 #27490 in 0.4.0.1-alpha and later.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29641#comment:4>
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