Performance Tuning RHEL 5 and Bind

brett smith brett.s9999 at
Sun Oct 20 01:34:45 UTC 2013

When all the Windows PC's are switched to our resolver, bind stops responding.
rndc querylog shows queries coming thru, I changed  tcp-clients from
1000 to 10000 but DNS seems lagging, so we switched back to the
original Windows Domain resolver. Besides increasing open files
tuning, what TCP / sysctl or named.conf settings can be set to
optimize / speed up DNS queries? Because it seems that Windows clients
use TCP instead of UDP when looking at netstat on the server.

Thanks. Brett.

On Sat, Oct 19, 2013 at 3:20 AM,  <sthaug at> wrote:
>> I need to build a pair DNS cache servers to support 5000+ clients (
>> PC's and Servers ).  I have been looking for some guides on tuning
>> BIND and the OS for Enterprise performance rather than the defaults.
>> The version of bind is bind-9.8.2.
> 5000 clients is such a low number that I don't think you need to worry
> about tuning at all.
> Steinar Haug, Nethelp consulting, sthaug at

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