[tor-bugs] #30953 [Core Tor/Tor]: ServerTransportListenAddr is ignored when stated second time for the IPv6 address

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#30953: ServerTransportListenAddr is ignored when stated second time for the IPv6
address
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     Reporter:  s7r           |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: 0.4.1.2-alpha
     Severity:  Normal        |   Keywords:  ipv6
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Currently is possible to run a dual stacked IPv4 + IPv6 bridge.

 `ORPort` can be set 2 times in torrc, once for IPv4 and once for IPv6 - it
 will open ports on both address families and listen for connections.

 However, `ServerTransportListenAddr` will only work for IPv4 and be
 ignored if set second time in the same torrc for the IPv6 family (no obfs4
 port open on the IPv6 address).

 Log file does not even mention it, it only confirms the IPv4 one:
 [notice] Registered server transport 'obfs4' at '<xxx>:port'

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30953>
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