[tor-bugs] #21310 [Core Tor/Tor]: Exits should tell clients when they are connecting to an IPv6-only hostname

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jan 30 08:03:44 UTC 2017


#21310: Exits should tell clients when they are connecting to an IPv6-only hostname
--------------------------+------------------------------------
 Reporter:  teor          |          Owner:
     Type:  defect        |         Status:  needs_revision
 Priority:  Medium        |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor  |        Version:  Tor: 0.2.4.7-alpha
 Severity:  Normal        |     Resolution:
 Keywords:  ipv6          |  Actual Points:  0.1
Parent ID:  #21311        |         Points:  1
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by teor):

 Replying to [comment:8 teor]:
 > Replying to [comment:5 arma]:
 > > ...
 > > I think if clients are going to say they're not ok with v4, then it's
 their responsibility to pick an exit that says it can do v6.
 >
 > I think we could keep this in, but we can't adjust the flags on the
 cell.

 What do current clients do?

 It seems like tor logs a warning in connection_ap_get_begincell_flags,
 when it should actually fail and choose another exit. (Or, even better,
 only choose IPv6-supporting exits on connections with NoIPv4Traffic set,
 and, although redundant in the current network, only choose
 IPv4-supporting exits on exits with NoIPv6Traffic set. We can't do this
 with PreferIPv6, because that would put all Tor Browser users on 12% of
 the exits.)

 So I guess we need to open another child ticket and make that change.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21310#comment:9>
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