https://bugzilla.wikimedia.org/show_bug.cgi?id=35542

       Web browser: ---
             Bug #: 35542
           Summary: Provide general means to map IP address spaces (IPv4
                    to IPv6 and back)
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: ipv6
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
        AssignedTo: [email protected]
        ReportedBy: [email protected]
            Blocks: 35540
    Classification: Unclassified
   Mobile Platform: ---


There are some tunneling protocols, like:

* 6to4
* Teredo
* ISATAP

where it is possible to derive real IPv4 address of the user even if he's
connecting via IPv6 to us. While we *may* use their IPv6 address for
contributions, we definitely should canonicalize those addresses for purposes
like blocking and CheckUser. 

We might need to have something like "79.163.138.172 (via
2002:4fa3:8aac::4fa3:8aac)" to be available (at least to CheckUsers if not
broader). 

We might end up needing a proxy gateway IP address somewhere as well, to block
some bad proxies (see bug 23343) or to trust them by the means of similar to
current XFF whitelist features (like
https://meta.wikimedia.org/wiki/XFF_project and
https://www.mediawiki.org/wiki/Manual:$wgSquidServersNoPurge)

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