[tor-bugs] #6876 [Tor Relay]: Add config option OutboundBindAddressIPv6

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#6876: Add config option OutboundBindAddressIPv6
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 Reporter:  ln5          |          Owner:                    
     Type:  enhancement  |         Status:  new               
 Priority:  normal       |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor Relay    |        Version:                    
 Keywords:  ipv6         |         Parent:                    
   Points:               |   Actualpoints:                    
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 We need a way to specify an outbound IPv6 address.

 Either we add OutboundBindAddressIPv6 or we start parsing
 OutboundBindAddress when we read configuration and store two outbound
 addresses, one for each supported address family.

 I have implemented the OutboundBindAddressIPv6 alternative (because it
 was easy). Let me know if we prefer the other one.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6876>
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