DNS flush

Sometimes you may need to do a DNS flush, say after a mysterious DNS network issue. Here are the commands.

Mountain Lion / Lion
sudo killall -HUP mDNSResponder

sudo dscacheutil -flushcache

lookupd -flushcache

ipconfig /flushdns

Run a nslookup or ping to check if you are indeed getting the correct IP(s) from the DNS server(s).

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