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To: Gunnar Lindberg <lindberg@cdg.chalmers.se>
Cc: dnsop@cafax.se
From: bert hubert <ahu@ds9a.nl>
Date: Thu, 20 Feb 2003 17:31:15 +0100
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In-Reply-To: <200302201539.QAA14337@wilfer1.cdg.chalmers.se>
Mail-Followup-To: bert hubert <ahu@ds9a.nl>,Gunnar Lindberg <lindberg@cdg.chalmers.se>, dnsop@cafax.se
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User-Agent: Mutt/1.3.28i
Subject: Re: timeout of glue A record

On Thu, Feb 20, 2003 at 04:39:02PM +0100, Gunnar Lindberg wrote:
> Is this a bug or a flaw in the DNS design? Some days ago we saw:

This is something a recursor has to deal with. Check out the 'syncres.cc'
file in the PowerDNS tar.gz (http://www.powerdns.com/downloads) for one way
to deal with this problem.

It is not really a bug in DNS design, it is a resolver challenge. Different
implementations solve it in different ways. One of the hardest problems is
to make sure that you don't end up in a loop but break out high enough so
you get records back.

DJB has some notes on this somewhere on http://cr.yp.to/djbdns/notes.html
which describe how his software and BIND solve this problem.

Regards,

bert

-- 
http://www.PowerDNS.com      Open source, database driven DNS Software 
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO
http://netherlabs.nl                         Consulting
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