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Flushing DNS cache entries in OSX
Here's how you can get OSX (Leorpard) to flush its DNS cache:
sudo dscacheutil -flushcache
If prior to doing so you wanted to see what it actually had cached, use the following:
sudo dscacheutil -cachedump -entries
Not terribly useful, but when you're setting up a LAN and there's some IP:name flux and you need to force OSX to see the new mapping, this is the way to do it.