Performance Tuning RHEL 5 and Bind

Alan Clegg alan at
Sun Oct 20 15:32:46 UTC 2013

On Oct 19, 2013, at 9:34 PM, brett smith <brett.s9999 at> wrote:

> When all the Windows PC's are switched to our resolver, bind stops responding.

What does "stops responding" mean?  Any logs?

> 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.

Are you really getting that many TCP based queries?  If so, something is seriously broken.

> 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.

Fix your windows clients.

Alan Clegg | +1-919-355-8851 | alan at

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 495 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <>

More information about the bind-users mailing list