Re: New Version Notification for draft-leiba-rfc2119-update-00.txt

Mark Andrews <marka@isc.org> Wed, 10 August 2016 02:15 UTC

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To: "John R Levine" <johnl@taugh.com>
From: Mark Andrews <marka@isc.org>
References: <20160809232819.1291.qmail@ary.lan> <20160809235853.C8D6650487EC@rock.dv.isc.org> <alpine.OSX.2.11.1608092140330.1678@ary.local>
Subject: Re: New Version Notification for draft-leiba-rfc2119-update-00.txt
In-reply-to: Your message of "09 Aug 2016 21:41:49 -0400." <alpine.OSX.2.11.1608092140330.1678@ary.local>
Date: Wed, 10 Aug 2016 12:15:36 +1000
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In message <alpine.OSX.2.11.1608092140330.1678@ary.local>al>, "John R Levine" writes:
> > RFC2671/RFC6891 has
> >
> >   Z
> >      Set to zero by senders and ignored by receivers, unless modified
> >      in a subsequent specification.
> >
> > which resulted in 2% of deployed nameservers just copying reserved
> > bits to the reply or 3% of nameservers not answering because a
> > reserved bit is set.
> 
> I suppose, but how many of the people who wrote the broken code would have 
> paid attention if it said YOU MUST SET THE BIT TO ZERO AND THEN IGNORE IT 
> YOU MORON.

We will never know.

"MUST be set to zero by senders and MUST be ignored by receivers,
unless modified in a subsequent specification." would have caught
those that scan for MUST, SHOULD and MAYs.

At the moment we have draft-ietf-dnsop-no-response-issue-03 to try
and clean up the mess out there.  I'm waiting on Tim for promised
feedback before I publish -04.

Mark

> Regards,
> John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
> Please consider the environment before reading this e-mail.
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org