Windows DNS/DHCP question


Does anyone know which settings in a Win 2008/2012 DHCP server direct it to the Primary DNS server to update zone information? I have configured my 2008 DHCP server scope to lease IP addresses with DNS services pointing to Resolvers which host a Read only copy of the Zone. Unfortunately, this means that DNS zone is not updating with new entries.  Can anyone help?

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There aren't any settings really which control which DNS server the updates will be attempted on.  It's just a matter of the processes built in to the OS.

Depending on the option set in DHCP, the DHCP server itself can do the dynamic DNS updates for the A records, but normally clients register their own records.  The following is taken from
The client processes the SOA query response for its name to determine the IP address of the DNS server authorized as the primary server for accepting its name. It then proceeds to perform the following sequence of steps as needed to contact and dynamically update its primary server:
◦ It sends a dynamic update request to the primary server determined in the SOA query response.
◦ If the update succeeds, no further action is taken.
◦ If this update fails, the client next sends an NS-type query for the zone name specified in the SOA record.
◦ When it receives a response to this query, it sends an SOA query to the first DNS server listed in the response.
◦ After the SOA query is resolved, the client sends a dynamic update to the server specified in the returned SOA record.
◦ If the update succeeds, no further action is taken.
◦ If this update fails, then the client repeats the SOA query process by sending to the next DNS server listed in the response.

The above is valid for statically configured clients, and DHCP clients which register their own records.  If you have the option set in DHCP for it to register all records, then for DHCP clients at least, it will be the DHCP server that attempts to update the records, using the process above.

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