[dns-operations] Reverse Lookup speedup

[Lutz Donnerhacke]

* Michael Monnerie wrote:
> As we primarily do mail servers, which tend to do a big amount of
> reverse lookup during spam checking, I was wondering if there's some
> similar way of loading (or slaving) a reverse lookup root zone. Sorry
> if this is stupid, I still do not understand how reverse lookups are
> done. Is that just the .in-addr.arpa zone that would need to be loaded,
> and if yes, where could I automatically get it from?

>From the statistics of the productive signed root which is used by several
mail and spamfiler servers, I can tell you, that the in-addr.arpa and
ip6.arpa entries are cached on the recursive name servers, so that there is
no performance benefit in slaving those zones.