clearing local caches
Scott Haneda
talklists at newgeo.com
Wed Jul 15 19:52:42 UTC 2009
On Jul 15, 2009, at 12:29 PM, Dave Sparro wrote:
> Scott Haneda wrote:
>> ... However, I would like to just get DNS response times.
>>
>> Perhaps take the list of hosts and feed them to a iterative script
>> calling dig, and fish out the response time? This does add the
>> problem of redirects of course would not be followed, so I would
>> have to pre-fetch all my urls and follow them to get my testing list.
>
> I don't see how you could call the results from any other method
> "DNS response times."
>
> If you used a web browser to measure from, you'd be introducing all
> sorts of other latencies. Delays from the web server itself. The
> webserver may have to talk to a database to output the HTML. The
> transfer of the actual HTML code isn't instantaneous. (ad that's
> just off the top of my head).
Correct. So I will end up pulling down the file, extracting the
hostnames, following any redirects, and extracting the resulting
hostnames. This gives me a nice list of hostnames that I can run
through an iterative loop in dig.
I just need to make sure that I am not getting a locally cached
result. I suspect there is no way to force a non caches result from
the remote ended resolver?
--
Scott * If you contact me off list replace talklists@ with scott@ *
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