[tor-bugs] #4455 [- Select a component]: 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:  - Select a component  |        Version:     
 Keywords:                        |         Parent:     
   Points:                        |   Actualpoints:     
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 First take on proposal 186 "multiple OR ports" (#3785) adds a second
 IP address to the routerinfo_t struct making it possible for a bridge
 to bind to an IPv6 address too.  Both addresses are announced in the
 descriptor, as per proposal 186.

 An OP which finds two IP addresses in a bridge descriptor and has both
 of these mentioned in Bridge config lines will have to prefer one over
 the other.  One way would be to add an option PreferIPv6 0|1 (with a
 default of 0).  Another way would be to prefer the one mentioned first
 in the config file (if the information of the order of config lines
 are kept after parsing the config file).

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