[tor-bugs] #21394 [Core Tor/Tor]: connection timeouts are affecting Tor Browser usability
Tor Bug Tracker & Wiki
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Thu Oct 26 07:01:57 UTC 2017
#21394: connection timeouts are affecting Tor Browser usability
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Reporter: arthuredelstein | Owner: (none)
Type: defect | Status: new
Priority: Very High | Milestone: Tor:
| 0.3.2.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: tbb-performance, tbb-usability, | Actual Points:
performance, tbb-needs |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by teor):
Replying to [comment:20 arthuredelstein]:
> I did some more experiments:
>
> ...
> Indeed I got 9/50 timeouts for the domain with http or https, but no
timeouts for IPv4 and only a single timeout for IPv6.
>
> Does this ring any bells for Tor core experts? What might be happening
with DNS here?
Some exits may be overloading their resolvers. Or our code may be buggy.
It would be helpful to identify the particular exits that are experiencing
these timeouts, and work out if they are in the same AS or using the same
resolvers.
I also wonder if we should ask bandwidth authorities to use DNS whenever
possible, so they see DNS timeouts, and downgrade exits that have them.
See #24010.
> Again I think the multiple timeouts are a little suspicious, and I don't
quite understand how that jibes with it being a (pure) exit node problem.
The only node in a tor path that uses DNS is an exit, so if DNS breaks, it
causes issues at the exit.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:22>
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