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):
On 15.05.25 17:01, Matus UHLAR - fantomas wrote:
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
...and the solution was:
turn off QNAME minimisation on DNS servers used by mailservers for
DNSBL/DNSWL checks.
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