Weird behaviour in wildcard CNAME - is this feature or bug? Can it be changed?

Tue Feb 11 13:45:09 UTC 2020

But, is this behaviour consistent with other DNS software (microsoft DNS 
etc.), or is this specific only to BIND9?

Is there any standard / documentation that explain how or why is this 
happening? Because it just doesn't make any sense to me.

On 11/02/2020 14:39, Tony Finch wrote:
> Petr Bena <petr at bena.rocks> wrote:
>> Why is this? Is that normal or a bug?
> It's because wildcards in the DNS are crazy and totally abnormal, but
> sadly ossified tradition means it cannot be considered a bug. (It's also
> intimately tied up with the subtle semantics of NXDOMAIN, and rigidly
> enforced by DNSSEC.) It's annoying because it makes wildcards a lot less
> useful than one might hope.
>
> https://tools.ietf.org/html/rfc4592 - The Role of Wildcards in the Domain Name System.
> https://tools.ietf.org/html/rfc8020 - NXDOMAIN: There Really Is Nothing Underneath.
>
> Tony.