Increase max-cache-size

[Alan Clegg]

Prabhat Rana wrote:
> I'm running BIND 9.5.1b1 on Solaris 10. Initially I didn't have any 'max-cache-size' parameter set in named.conf. When I was getting 1500 or more rercursive clients at any given time according to 'rndc status', I noticed some latency in recursive requests. I added the 'max-cache-size  500M;' and that seemed to help the latency because the number of lookups to the internet was reduced due to most of the request being fulfilled by the cache. I still have 25G Memory free. So my questions are. 
> Where does the named cache sit? in memory? 
> What is the max-cache-size by default?
> What is the max value I can assign for cache?
> I understand if I increase the size of cache it increases the security risks for cache poisoning. But I need to increase is so that as much possible queries are served by the cache
> Any help would be greatly appreciated.
In BIND 9.5, default max-cache-size is 32M.

Max is "0" which will allow the cache to grow to fill all available memory.

There is no additional risk of cache poisoning based on larger cache.

AlanC