[tor-bugs] #33242 [Core Tor/Tor]: Prop 312: 3.2.5. Make Relays do IPv4 and IPv6 Directory Fetches

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#33242: Prop 312: 3.2.5. Make Relays do IPv4 and IPv6 Directory Fetches
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     Reporter:  teor            |      Owner:  teor
         Type:  defect          |     Status:  assigned
     Priority:  Medium          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  prop312, ipv6
Actual Points:                  |  Parent ID:  #33241
       Points:  1               |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 Relays should start fetching directory documents over IPv4 and IPv6, so
 they can use X-Your-Address-Is HTTP headers to find their IPv6 addresses.

 Bridges must only fetch directory documents over IPv4, because they try to
 imitate clients. (So they can't find their IPv6 addresses in this way.)

 We propose to use a simple load balancing scheme for IPv4 and IPv6
 directory requests:
   * choose between IPv4 and IPv6 directory requests at random.

 We do not expect this change to have any load-balancing impact on the
 public
 tor network, because the number of relays is much smaller than the number
 of clients. However, the 6 directory authorities with IPv6 enabled may see
 slightly more directory load, particularly over IPv6.

 See proposal 312, section 3.2.5, directory fetch part:
 ​https://gitweb.torproject.org/torspec.git/tree/proposals/312-relay-auto-
 ipv6-addr.txt#n429

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33242>
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