[dns-wg] DNS reverse configuration

Hello Gilles,

On 6 Oct 2021, at 8:45, ANTONETTI Gilles wrote:

> Dear Support,
>
> My question is related to reverse DNS configuration.
> We are LIR for an organization (administration) owning a /16.
> 2 DNS servers of this organization have delegation for reverse 
> requests.
>
> Due to IPv4 addresses exhaustion, we have dedicated the last /24 to 
> another organization (administration).  The /24 is already used.
> Now the problem is that the (owner) organization doesn't want to host 
> our reverse records for the last /24.
>
> So, my question is it possible to declare 2 different DNS for 
> delegation only for the /24 ?
>

yes, it's possible. The solution is documented in RFC 2317 "Classless 
IN-ADDR.ARPA delegation" 
(https://datatracker.ietf.org/doc/html/rfc2317).

It's a little bit tricky to understand but it works well.

Greetings

Carsten Strotmann