Unexpected/Unwanted DNS lookups
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During a period of apalling DNS response times we became aware that our CGI scripts were suffering an intermittent ~25 second delay between the browser "Click" and the CGI starting execution. This seemed to be caused by DNS lookups.
We don't use reverse DNS in our error logs, so I'm wondering what else might be calling on DNS services?
We've now fixed the DNS issues, so this is something of an intellectual exercise, but there is always the response time bonus of eliminating the DNS calls to consider.
The server in question is IBM internal, so beyond the reach of all bar IBM personnel and expert hackers.
--
Steve Swift
http://www.swiftys.org.uk
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