[tor-bugs] #18177 [DocTor]: Check Fallback Directory IPv4 and IPv6 addresses using DocTor

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#18177: Check Fallback Directory IPv4 and IPv6 addresses using DocTor
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     Reporter:  teor         |      Owner:  atagar
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  DocTor       |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 In #17158, we added a list of default fallback directories to Tor. Most
 clients will use these fallback directories to bootstrap in preference to
 the authorities.

 After #17840 is merged, tor clients can bootstrap over IPv6. If the
 fallback directory has an IPv6 address, IPv6 clients will use it.

 Can we check fallback IPv4 and IPv6 addresses regularly using DocTor?

 It would be nice to report a summary figure, something like:
 "200/250 fallback directories (80%) are reachable"

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18177>
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