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List:       postfix-users
Subject:    [pfx] Re: IPv6 and RBL checks
From:       Steffen Nurpmeso via Postfix-users <postfix-users () postfix ! org>
Date:       2024-05-15 18:16:39
Message-ID: 20240515181639.82uSMjv6 () steffen%sdaoden ! eu
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Benny Pedersen via Postfix-users wrote in
 <a95aa4938b2c4e228a80b2d8eb3fb2f0@junc.eu>:
 |Jos Chrispijn via Postfix-users skrev den 2024-05-15 11:25:
 |> Can someone explain why bl.spamcop.net reverses the ipv6 ip, thus not
 |> recognizing it like postscreen?

This is the usual way to do reverse lookups.  RFC 1034 from 1987:

   2. Host address to host name translation

      This function will often follow the form of previous
      functions.  Given a 32 bit IP address, the caller wants a
      character string.  The octets of the IP address are reversed,
      used as name components, and suffixed with "IN-ADDR.ARPA".  A
      type PTR query is used to get the RR with the primary name of
      the host.  For example, a request for the host name
      corresponding to IP address 1.2.3.4 looks for PTR RRs for
      domain name "4.3.2.1.IN-ADDR.ARPA".

This was then taken over to IPv6, and got a bit lengthy.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
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