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In this mode, the DHCP server always performs updates of the client’s FQDN, leased IP address information, and both its host (A) and pointer (PTR) resource records, regardless of whether the client has requested to perform its own updates.” “With secure dynamic update, only the computers and users you specify in an ACL can create or modify dns Node objects within the zone.
By default, the ACL gives Create permission to all members of the Authenticated User group, the group of all authenticated computers and users in an Active Directory forest.
When either type of client (static or DHCP client) initiates an A record update with its authoritative DNS server, it will first start by performing an SOA query for the FQDN of the client in question: The client then receives a response from the authoritative DNS server containing information about the server that is to process the dynamic update.
From there, the client continues communicating with the primary DNS server that accepted the A record update.
Statically-set clients (static clients) that perform dynamic updates will send updates for both its A record (forward lookup record) and its PTR record (reverse lookup record) to the authoritative DNS server.
Clients with dynamically-set network connections (DHCP clients) will communicate with both the authoritative DNS server and the DHCP server for updating A and PTR records.
This happens even though DHCP registered the record.
To configure DHCP Option 081, you must look at the DHCP server properties, under the DNS Tab in DHCP properties. If you have Windows 2008 R2 or Windows 2012 R2, in addition to configuring the DNS tab to force registration, you still must configure credentials and add the server to the Dns Update Proxy group.With the default settings, a duplicate A record gets registered by DHCP with the client’s new IP.This is because the client will not update itself due to the current record in DNS is beyond the lease period.From there, the client continues communicating with the primary DNS server that is accepting the PTR record update.Please see For a DHCP client, when some particular action causes its IP address to change, such as a DHCP lease renewal, if the client supports it, it will send Client FQDN information (DHCP option 81 flags) to the DHCP server.