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I have a question about delegation of a subdomain and a sub-subdomain from the same server.

I have a DNS server NS1 where I have a delegation for the domain dom2.example.com pointed to the server NS2. I.e. on the server NS1 I have a record like:

dom2.example.com NS NS2

And on the server NS2 I have a delegation for the domain dom3.dom2.example.com pointed to the server NS3. I.e. on the server NS1 I have a record like:

dom3.dom2.example.com NS NS3

I would like to move that last NS record to the server NS1. What will then happen if the client makes a DNS query for the record record1.dom3.dom2.example.com

Will the server NS1 forward to the server NS2 or to the server NS3?

I.e. will the delegation of the sub-subdomain work if the subdomain itself is delegated?

Thanks.

Roman_T
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  • "And on the server NS2 I have a delegation ... I.e. on the server NS1 I have a record like:" this is not clear or contradictory. Is the delegation out of NS2 or NS1? Also, it may be simpler just to give the real names when discussing things... – Patrick Mevzek Jun 03 '20 at 15:55
  • Also please do not say "forward". This term does not exist in the DNS, it comes from HTTP land. DNS does not "forward" queries from one zone to another in the sense you use it. DNS uses delegations and zone cuts, to find out authoritative nameservers for a given name. – Patrick Mevzek Jun 03 '20 at 15:56

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