DNS TTL adherence

Christopher L. Morrow christopher.morrow at verizonbusiness.com
Wed Mar 15 16:09:38 UTC 2006

On Wed, 15 Mar 2006, Simon Waters wrote:
> > This behavior is unfortunately not unique.
> Alas what others peoples servers do, shouldn't be an issue for you. Your
> problem is they can be coerced into a DoS attack, not that the data is stale.

actually, dos-attack-aside, the interesting thing is that lots of people
(original poster perhaps included) believe that TTL's are adhered to
except in some marginal cases. I think Rodney's point is that they are not
adhered to anywhere near as much as we would all like to believe :(

So, if you, or the original poster, is going to move ${important_resource}
around ip-wise keep in mind that your ${important_thing} may have to
answer to more than 1 ip address for a period much longer than your tuned
TTL :(

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