Scavenging in Domain Name System (DNS) allows you to have a cleaner DNS database by removing old or stale records because DNS Resource records can and do become stale. This is particularly true if machines IP addresses change and the DNS server is unaware of the change and the database is not updated.
DNS aging and scavenging is quite similar to Windows Internet Name Service (WINS) and Domain Name System (DNS) scavenging. However unlike WINS and DHCP there is little maintenance that needs to be performed for it to operate and to function as expected.
You should however set up DNS aging and scavenging because DNS is notorious for not removing old or stale records from its database if you have a very busy or large infrastructure in place this is particularly true.
Since DNS aging and scavenging are not enabled by default you must manually enable it by following the step here..
1. From the Program menu select “Administrative Tools” then Select “DNS” to open the DnsMgmt – (DNS\ServerName) snapin.
2. Then from the tool menu select “Action” and select “Set Aging/Scavenging for All Zones”
3. From the Server Aging/Scavenging Properties dialog box select “Scavenge stale resource records” and adjust the “No-refresh interval;” and the “Refresh Interval” as needed and select “OK” then exit the DnsMgmt – (DNS\ServerName) snapin.
In ConfigMgr 2007 you may find that when you manually or programmatically remove a machine that has been