Hello, 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): [cid:image002.png@01DBC5B3.192E1570]
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