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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Flusing the DNS cache

Posted by jpluimers on 2010/09/10

DNS is the fundament for resolving names to IP-adreesses.
Without it, no internet browsing or other connections to the outside world.

Like a lot of communication optimizations, caching improves the speed of DNS too ([Wayback/Archive] All programming is an exercise in caching -Terje Mathisen).

Sometimes, bad or unwanted DNS entries end up in your cache.
Those prohibit some of the communication.

Luckily, How to Flush DNS explains this for 3 platforms: Windows, Mac OSX and Linux:

  • Windows:
    ipconfig /flushdns
  • Mac OSX:
    10.5 and up: dscacheutil -flushcache
    pre 10.5: lookupd -flushcache
  • Linux:
    /etc/init.d/nscd restart

–jeroen – now happy he flushed an unwanted DNS entry from the cache

via: [Wayback/Archive] How to Flush DNS – Top Bits

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