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I'm having trouble finding it this answer, but what is the lowest TTL that can be set on an A or CNAME record in BIND9?

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The lowest TTL that you can technically set, or the lowest TTL that will be honored elsewhere on the Internet? –  jamieb Feb 22 '10 at 21:36

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You can set it to 0, but that doesn't mean a caching DNS server will honor that request.
Many servers have a default minimum TTL for records, and the cache server will not allow the TTL to be less.

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