Funny how Apple sometimes ‘fixes’ things by giving the remedy a new name:
Under 10.4 the ‘fancy’ cache would go made quiet frequently. Basically you’d see the wrong web page, while other commands like
ping etc still reach the proper server.
sudo lookupd flushcache
used to fix that. Of course the bug has not been fixed in 10.5.2 but the remedy is called now:
dscacheutil -flushcache