Revision of Howto clear/Flush DNS Cache in Ubuntu from Thu, 01/10/2008 - 05:01

Some distributions run a caching nameserver in the background out of the box while some do not. To clear the cache if you have such a daemon running, simply restart the nscd service in ubuntu.
Why would you clear your cache?
Most DNS clients will cache the results of name resolution request to speed up multiple lookups [...]