long FQDN resolution

[Matus UHLAR - fantomas]

On 15.05.25 14:31, DEMBLANS Mathieu wrote:
>I have a question about mecanism for requests of long subdomains FQDN.
>Our DNS, which is in recursive configuration, split long fqdn request with subdomains requests like :
>
>Original request from the client to our recursive DNS : A a.b.c.d.example.com
>
>Requests done by our DNS to the domain example.com NS:
>A  _.c.d.example.com
>A _b.c.d.example.com
>A a.b.c.d.example.com
>
>Is it a normal behaviour ?
>
>This is only done for 4 levels domains (a.b.example.com for example) and more, not < normal > fqdn (ex : www.example.com).
>What part of the configuration manage this mecanism ?
>Is this really usefull ?
>
>It is problematic for DNSBL requests because it generate a lot of useless requests and this kind of service look at the number of requests done (usage policy):

It's been nearly a year since I asked the same, the results are in list 
archive:

https://lists.isc.org/pipermail/bind-users/2024-May/108537.html



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