domain name system - Windows Server 2003 DNS

We use windows server 2003 for DNS on our network. The
forward DNS entries ("A" records) for windows machines on the domain are populated
automatically. However, the reverse DNS entries ("PTR" Records) are not. The reverse
lookup zone exists, and I can add entries to it manually, but it doesn't automatically
populate the client IP are still in forward lookup zone DC.local. Dynamic updates are
enabled for both the forward and reverse zones.
On the DCHP Pool I have Enable
Dns dymanic updates according to setting > Dymanically update dns A and PRT records
only if requested by DCHP Clients
Tick in Discard A and PRT records when
leased is deleted

DNS I set Scanege
stales records every 3 days on Forward Lookup Zones and Reverse lookup zone 3
days

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