DNS cache Validation

Mark Tinka mark.tinka at seacom.mu
Tue May 19 09:11:27 UTC 2020


On 19/May/20 10:31, Mukund Sivaraman wrote:

>
> (1) Check the size of your cache and ensure that it is not too small and
> that it is bound. The max-cache-size config option will limit it. In old
> versions of named, there was no limit. Current versions have an
> automatic limit. You want this size to be at least a few hundred MB for
> a small LAN and larger if it is a widely used resolver. Check the "cache
> records deleted due to memory exhaustion" counter in rndc stats output.

In current versions of BIND, my understanding is that the default value
is 90% of the detected physical memory, in case nothing specific is
defined by the operator.

Mark.



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