[tor-bugs] #15235 [Tor]: Identify the state of IPv6 support in Tor

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#15235: Identify the state of IPv6 support in Tor
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 Reporter:  nickm                                |          Owner:
     Type:  task                                 |         Status:
 Priority:  Medium                               |  assigned
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.8.x-final
 Keywords:  tor-client, tor-relay, ipv6,         |        Version:
  research, 027-triaged-1-out                    |     Resolution:
Parent ID:                                       |  Actual Points:
  Sponsor:                                       |         Points:  medium
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Comment (by teor):

 Replying to [comment:6 teor]:
 > 5 directory authorities have IPv6 addresses
 > these addresses aren't hardcoded into tor, nor would they be parsed if
 they were (#17327)
 Fixed, awaiting #17813 to see if urras has an IPv6 address in its new
 config. (Because of this, 4 directory authorities now have IPv6 addresses
 hard-coded into tor.)

 > Tor doesn't know how to tell if IPv6 works, so it just uses IPv4 by
 default (#17217)
 Tor still needs to be configured manually for IPv6. We probably want to
 keep it this way until we have more relays on IPv6 for anonymity and load-
 balancing reasons.

 > Tor doesn't have a setting to disable IPv4 (#9068)
 Fixed in #17840

 > Tor won't bootstrap over IPv6 (#17281)
 Fixed in #17840

 > Tor doesn't listen on IPv6 by default on the SOCKSPort (#11360)
 But it can be configured with an explicit IPv6 SOCKSPort.

 New items:
 * We're running an opt-in trial for fallback directories (#17158), about
 20% of them have IPv6 addresses (#8374). This reduces client dependence on
 the IPv6 authorities.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15235#comment:7>
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