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Re: [dnsext] we need help to make names the same, was draft-yao-dnsext-identical-resolution-02 comment

Mark Andrews <marka@isc.org> Thu, 17 February 2011 06:14 UTC

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To: Doug Barton <dougb@dougbarton.us>
From: Mark Andrews <marka@isc.org>
References: <32007060.266.1297829868445.JavaMail.root@benjamin.baylink.com><4D5CAC77.2050301@dougbarton.us>
In-reply-to: Your message of "Wed, 16 Feb 2011 21:04:55 -0800." <4D5CAC77.2050301@dougbarton.us>
Date: Thu, 17 Feb 2011 17:14:45 +1100
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Cc: dnsext@ietf.org
Subject: Re: [dnsext] we need help to make names the same, was draft-yao-dnsext-identical-resolution-02 comment
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In message <4D5CAC77.2050301@dougbarton.us>, Doug Barton writes:
> On 02/15/2011 20:17, Jay Ashworth wrote:
> > And, as has been pointed out in some other venues, and which seems
> > applicable here also, some approachs to certain things *depend on trying
> > a DNS lookup and having it break*.  I'm damned if I can remember what
> > the canonical example was, but it fell in the general category of
> > "please don't make this change to try to 'help' 'the web', cause you'll
> > break*my*  protocol which isn't http".
>
> It would be really great if we could find a pointer to that discussion, 
> since some of us are still working on trying to solve the problem and 
> would prefer not to make things worse. :)

The classic case is the email typo.  It fails immediately with
NXDOMAIN but has to wait for the MTA to timeout the connects with
"helpful" address records.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org
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