I configured Name Protection on DHCP. As far as I know, DNS A/PTR Records are discarded and not deleted by DHCP after DHCP Lease expiration.
Here's my problem:
- Client A gets an IP from DHCP with an 8 day lease. DHCP registers record in DNS.
- After 9 days the lease expires and client B gets the the same as A did. DHCP registers a record in DNS.
- Now I have two PTR/A Records to the same IP…
Is DNS Scavenging the only option I have to prevent multiple A/PTR records to the same IP? From my understanding I would configure DNS Scavenging based on the following formula
DHCP Lease Periode <= NoRefrehPeriod + Refresh + Scavenging Period
For an 8 days lease duration I would set
- NoRefreshPeriode: 3 days
- Refresh: 4 days
- Scavenging Period 1 days
Please let me know if I misunderstood something. DCs are Windows Server 2008R2
best regards
Pirmin