consolidating Reverse Zones
Tony Finch
dot at dotat.at
Thu Oct 21 11:49:14 UTC 2021
Edwardo Garcia <wdgarc88 at gmail.com> wrote:
>
> I guess bind can not consolidate like this and we have to put up with a
> million /24 zone files ? I was thinking because we can do classless dele
> with smaller than /24, it would work on bigger :)
It is possible! The basic idea (very briefly) is:
With classless reverse DNS for prefixes longer than /24, you need a CNAME
in the /24 zone pointing at each address in the classless zone.
For shorter prefixes, you need a DNAME in the /16 zone pointing at each
/24 in the classless zone.
There are some documents explaining how we use this trick in production
at https://www.dns.cam.ac.uk/domains/reverse/ with links to the less
Cambridge-specific explanations in the last two paragraphs of that page,
viz:
https://www.dns.cam.ac.uk/domains/reverse/technical.html
https://tools.ietf.org/html/draft-fanf-dnsop-rfc2317bis
Tony.
--
f.anthony.n.finch <dot at dotat.at> https://dotat.at/
Lundy, Fastnet: Northwest 4 or 5, occasionally 6 in Lundy. Rough or
very rough, becoming moderate or rough, then moderate later. Showers.
Good, occasionally moderate.
More information about the bind-users
mailing list