IPCleanLifetime

The amount of time a machine name/IP address pair remains in DC Agent’s cache before it is removed, in seconds.

Default	7200 [seconds = 2 hours]
Options	Integer greater than 3600, or 0 to disable
Synopsis	As DC Agent receives logon session information, it stores machine name/IP address pairs in its local memory cache. This reduces the number of times DC Agent must perform DNS lookups for each active client machine, because it already has the IP address.