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Dig reports the time left until the TTL expires rather than the actual TTL value. If the number varies, it is most likely that you're querying different DNS servers (for example, round robin) which have the record cached for different amounts of time, and therefore have different expiry times. If you run the same query against the same DNS server, you will ...


You don't need to do this. Linux will drop all caches if it needs the RAM for other purposes. See http://www.linuxatemyram.com/ and Why is Linux reporting "free" memory strangely? for more information.

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