Clearing the DNS Cache

The Clear Cache button from the GUI, or the d nsflush command (for more information about the dnsflush command, see the IronPort AsyncOS CLI Reference Guide, available from the location specified in Documentation), clears all information in the DNS cache. You may choose to use this feature when changes have been made to your local DNS system. The command takes place immediately and may cause a temporary performance degradation while the cache is repopulated.