Configure DNS scavenging on the Windows server

Configure DNS scavenging to locate stale DNS records. DNS Scavenging is a Microsoft feature that removes outdated DNS resources. This ensures environments using DHCP do not detect duplicate devices based on multiple DNS entries for the same device.

1. Log in to the client environment, and click Start > Programs >Administrative Tools > DNS > DNS Manager.
2. Right-click the applicable DNS server, and click Set Aging/Scavenging for all zones.
3. Ensure Scavenge stale resource records is selected.
4. Set the No-refresh interval and Refresh interval so the combined duration is equal to or less than your DHCP lease, and click OK.
5. For example, if your DHCP lease is 24 hours, the default for each field could be 12 hours or less.
6. Select Apply these settings to the existing Active Directory-integrated zones, and click OK.
7. Right-click the applicable DNS server, and click Scavenge State Resource Records to start immediate scavenging.

At the defined time frame, the server searches the DNS records and purges outdated information.

For more information on DNS scavenging, see the Microsoft TechNet article How DNS Aging and Scavenging Works.