[tor-bugs] #20175 [Core Tor/Tor]: Allow the fallback script to ignore temporary IPv6 addresses

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#20175: Allow the fallback script to ignore temporary IPv6 addresses
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal        |   Keywords:  fallback, ipv6
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 When updateFallbackDirs.py checks relay addresses, it makes sure that the
 IPv4 and IPv6 addresses and ports match the relay's whitelist entry.

 If a relay's IPv6 address is temporary, it should not be included in the
 whitelist.

 But this means the relay will never be selected, because its descriptor
 has an IPv6 address, and that address doesn't match the (missing) address
 in the whitelist.

 We should add a way to say ipv6=ignored or something.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20175>
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