I have a question that I cant find any documentation on or easily test in my environment.
Here is the scenario:
2 separate DHCP servers at 2 separate sites (DHCP Server A, DHCP Server B), each with their own scope but share the same DNS domain.
Dynamic DNS is turned on and set to Always Dynamically update DNS A and PTR records, as well as Discard A and PTR records when lease is deleted
Dynamic DNS is also set to use a service account, and each DHCP server has it's own service account.
The question:
Client A registers with DHCP Server A and gets a 7 day lease. DHCP Server A registers the A and PTR records in DNS for Client A. 2 days later, Client A leaves the site and goes to the other site. Client A now gets a DHCP lease from DHCP Server B.
Will DHCP Server A be notified that Client A just received a new DHCP address from DHCP Server B and thus delete the old (old because they were registered by DHCP Server A) A and PTR records from the DNS server, or will this result in multiple DNS entries (one registered by DHCP Server A and the other by DHCP Server B) for the same client?
Side question: If DHCP Server A does not get notified and does not clean up the record, does using the same service account on both DHCP servers rectify that issue? Is there a better way to approach Dynamic DNS in this scenario?