Re: [tor-bugs] #20071 [Core Tor/Tor]: Tor clients need 4 routers when connecting via IPv6, but only 3 using IPv4

[Tor Bug Tracker & Wiki]

#20071: Tor clients need 4 routers when connecting via IPv6, but only 3 using 
IPv4
-+-
 Reporter:  teor |  Owner:
 Type:  defect   | Status:  new
 Priority:  Low  |  Milestone:  Tor:
 |  unspecified
Component:  Core Tor/Tor |Version:
 Severity:  Minor| Resolution:
 Keywords:  testing, ipv6, chutney, tiny-|  Actual Points:
  network, tor-client, needs-diagnosis   |
Parent ID:  #19989   | Points:  2
 Reviewer:   |Sponsor:
-+-
Changes (by nickm):

 * keywords:  testing, ipv6 => testing, ipv6, chutney, tiny-network, tor-
 client, needs-diagnosis


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Re: [tor-bugs] #20071 [Core Tor/Tor]: Tor clients need 4 routers when connecting via IPv6, but only 3 using IPv4

[Tor Bug Tracker & Wiki]

#20071: Tor clients need 4 routers when connecting via IPv6, but only 3 using 
IPv4
---+-
 Reporter:  teor   |  Owner:
 Type:  defect | Status:  new
 Priority:  Low|  Milestone:
Component:  Core Tor/Tor   |Version:
 Severity:  Minor  | Resolution:
 Keywords:  testing, ipv6  |  Actual Points:
Parent ID:  #19989 | Points:  2
 Reviewer: |Sponsor:
---+-

Comment (by arma):

 (If you can get me a stack trace for when this log complaint happens, I
 can try to guess whether it's being called in a reasonable way.)

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Re: [tor-bugs] #20071 [Core Tor/Tor]: Tor clients need 4 routers when connecting via IPv6, but only 3 using IPv4

[Tor Bug Tracker & Wiki]

#20071: Tor clients need 4 routers when connecting via IPv6, but only 3 using 
IPv4
---+-
 Reporter:  teor   |  Owner:
 Type:  defect | Status:  new
 Priority:  Low|  Milestone:
Component:  Core Tor/Tor   |Version:
 Severity:  Minor  | Resolution:
 Keywords:  testing, ipv6  |  Actual Points:
Parent ID:  #19989 | Points:  2
 Reviewer: |Sponsor:
---+-

Comment (by arma):

 That log message comes from
 {{{
   if (num_acceptable_routers < routelen) {
 log_info(LD_CIRC,
  "Not enough acceptable routers (%d/%d). Discarding this
 circuit.",
  num_acceptable_routers, routelen);
 return -1;
   }
 }}}
 so it would seem that routelen is 4 for this case (rather than "one of the
 routers is unacceptable").

 routelen gets set here:
 {{{
   routelen = DEFAULT_ROUTE_LEN;
   if (exit_ei &&
   purpose != CIRCUIT_PURPOSE_TESTING &&
   purpose != CIRCUIT_PURPOSE_S_ESTABLISH_INTRO)
 routelen++;
 }}}

 So: are you causing this ipv6 circuit to be called in such a way that
 you're specifying which exit it should use, and it's not a testing or
 server-side-establish-intro circuit?

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[tor-bugs] #20071 [Core Tor/Tor]: Tor clients need 4 routers when connecting via IPv6, but only 3 using IPv4

[Tor Bug Tracker & Wiki]

#20071: Tor clients need 4 routers when connecting via IPv6, but only 3 using 
IPv4
--+---
 Reporter:  teor  |  Owner:
 Type:  defect| Status:  new
 Priority:  Low   |  Milestone:
Component:  Core Tor/Tor  |Version:
 Severity:  Minor |   Keywords:  testing, ipv6
Actual Points:|  Parent ID:  #19989
   Points:  2 |   Reviewer:
  Sponsor:|
--+---
 The minimum number of routers in an IPv4-only Tor network is 3. But when a
 client is using IPv6, that goes up to 4, with the following log message:
 {{{
 Sep 06 13:27:47.000 [info] new_route_len: Not enough acceptable routers
 (3/4). Discarding this circuit.
 }}}

 Why is one router considered unacceptable? Is this another instance of
 #19989? (One of these routers is an exit.)

 This can be tested using chuntney's client-ipv6-only network.

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