[tor-bugs] #18580 [Tor]: exit relay fails with 'unbound' DNS resolver when lots of requests time-out

Sat Mar 19 17:30:19 UTC 2016

#18580: exit relay fails with 'unbound' DNS resolver when lots of requests time-out
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 Reporter:  Dhalgren  |          Owner:
     Type:  defect    |         Status:  new
 Priority:  Medium    |      Milestone:
Component:  Tor       |        Version:  Tor: 0.2.7.6
 Severity:  Major     |     Resolution:
 Keywords:            |  Actual Points:
Parent ID:            |         Points:
 Reviewer:            |        Sponsor:  None
----------------------+------------------------------

Comment (by Dhalgren):

 One obvious difference is that `named` times-out requests in ten seconds
 and does not fall-back to TCP (with DNSSEC disabled), at least when
 querying via `dig`.

 `Unbound` tries for 120 seconds, falling back to TCP.  Researched
 `unbound` time-outs and did not find a way to modify the behavior.

 https://unbound.net/documentation/info_timeout.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18580#comment:4>
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