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Re: caching dns lookups
- To: nyh(at-nospam)math.technion.ac.il (Nadav Har'El)
- Subject: Re: caching dns lookups
- From: Dan Kenigsberg <danken(at-nospam)cs.Technion.AC.IL>
- Date: Thu, 30 Aug 2001 13:56:22 +0300 (IDT)
- Cc: linux-il(at-nospam)linux.org.il
- Delivered-To: linux.org.il-linux-il@linux.org.il
- In-Reply-To: <20010830011154.A23578@leeor.math.technion.ac.il> from "Nadav Har'El" at Aug 30, 2001 01:11:54 AM
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
Thanks you all for addressing my DNS question.
I cannot report any success yet. Something is still rotten my intallation of
named, probably. (!??)
> Lastly, Dan, are you sure you really want to use a DNS cache? What was the
> reason you decided you wanted one?
> In most cases a DNS cache is not useful to "ordinary" modem users. Why?
> Because typically (when the modem is not busy), your modem round-trip time
> to your ISP's DNS would about around 130 millisec. Your ISP already carries
> a big cache in its nameserver. So all you're adding is 130 millisec to each
> DNS query.
Nadav, am I the only one seeing 'resolving foo.bar.com' in the status line for
long seconds?
> This isn't too bad for casual web browsing and similar activity
> (and note that individual applications do cache the DNS resolutions, so
> Mozilla doesn't have to resolve the same domain name over and over).
So I really cannot explain why I sometimes get DNS errors messages
when I click 'next' on a google page.
I'll have to tcpdump to the bottom of it.
Dan.
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