[tor-bugs] #27491 [Core Tor/Tor]: Prefer IPv4 or IPv6 based on the number of failures

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#27491: Prefer IPv4 or IPv6 based on the number of failures
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 Reporter:  neel                  |          Owner:  neel
     Type:  enhancement           |         Status:  needs_information
 Priority:  Medium                |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor          |        Version:
 Severity:  Normal                |     Resolution:
 Keywords:  needs-proposal, ipv6  |  Actual Points:
Parent ID:  #17835                |         Points:
 Reviewer:  mikeperry             |        Sponsor:
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Changes (by teor):

 * status:  needs_review => needs_information
 * keywords:   => needs-proposal, ipv6


Comment:

 Thanks for this code. It looks like you put a lot of work into it. Your
 work is valuable, because it helps us see what kind of questions we need
 to answer.

 We need to think carefully about the design and implementation of this
 feature. Otherwise, users could rely on this feature, and that makes it
 hard for us to change it later.

 When we design a complex feature, we do the design in a proposal, so we
 can work through the design issues without changing the code all the time.
 Here's our proposals process:
 https://gitweb.torproject.org/torspec.git/tree/proposals/001-process.txt

 If you're having trouble writing a whole proposal, just write an email to
 tor-dev explaining how this new feature works. We can help you from there.

 Once we have a proposal, we can work out how to implement this feature.
 For example, tor already tracks connection history in rephist.c. At the
 moment, this code forgets all its IP history once a week. But maybe it
 should just forget the oldest IP failures, not all the IP failures.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27491#comment:6>
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