[tor-bugs] #4455 [Tor Client]: Add configuration option PreferIPv6?

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#4455: Add configuration option PreferIPv6?
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 Reporter:  ln5         |          Owner:     
     Type:  defect      |         Status:  new
 Priority:  normal      |      Milestone:     
Component:  Tor Client  |        Version:     
 Keywords:              |         Parent:     
   Points:              |   Actualpoints:     
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Comment(by ln5):

 Replying to [comment:1 arma]:
 > Second, based on the name it sounds like the behavior will be "try all
 your ipv6 bridges first, and if none of them work fall back to your ipv4
 bridges". That's a fine behavior for many users. Will we have users who
 want "try all your ipv6 bridges, and if none of them work fail"? What
 lines will we expect those users to set in their torrc, and will they be
 confused by any of the other names of our new options?

 The name is clearly bad.  This was not meant to guide the client to chose
 one Bridge line over another but rather to chose one of two IP addresses
 in a descriptor, filtered indeed through "do I have this address in a
 Bridge line?".

 This configuration option would be a last resort for this choice, if all
 else fail.  The only sane influence on this choice beside configuration is
 a note in the routerinfo_t on whether we've seen the IPv6 address in a
 connection or not.

 The option could be named PreferIPv6AddressOfBridges.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4455#comment:3>
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