[tor-bugs] #17849 [Tor]: Warn if single-stack IPv4/IPv6 clients have very restricted guard choices

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#17849: Warn if single-stack IPv4/IPv6 clients have very restricted guard choices
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 Reporter:  teor         |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:  ipv6         |  Actual Points:
Parent ID:  #17811       |         Points:
  Sponsor:               |
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Comment (by teor):

 We don't currently warn if FascistFirewall is set, even though that
 restricts guard choices.

 If we do implement this, the warning should apply to:
 * IPv6-only clients
 * Clients that set any of the ReachableAddresses options
 * Clients that set any of the ExcludeNodes or Nodes options (???)
 * IPv4-only clients (for future-proofing)

 It could be easier to implement this after #9068 is done.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17849#comment:2>
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