Performance Tuning RHEL 5 and Bind

Alan Clegg alan at
Wed Oct 23 01:39:14 UTC 2013

On Oct 22, 2013, at 8:29 PM, brett smith <brett.s9999 at> wrote:

> Yes tuning off IPTABLES conn-tracking makes a huge difference. I also followed:
> I still see some SYN_SENT from Windows PC's on tcp port 53 on the DNS
> cache server.

You've cured the symptoms, not the illness.

You really, REALLY need to figure out why your clients are doing TCP.  You'll see a world of difference when you solve this part of the puzzle.

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

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