Benny Pedersen via Postfix-users wrote in
<[email protected]>:
|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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