Re: [dnsext] [Editorial Errata Reported] RFC4343 (5112)

"Jay R. Ashworth" <jra@baylink.com> Tue, 26 September 2017 20:56 UTC

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Date: Tue, 26 Sep 2017 20:55:59 +0000 (UTC)
From: "Jay R. Ashworth" <jra@baylink.com>
To: Peter van Dijk <peter.van.dijk@powerdns.com>
Cc: dnsext@ietf.org, rfc-editor@rfc-editor.org
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Subject: Re: [dnsext] [Editorial Errata Reported] RFC4343 (5112)
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> From: "Peter van Dijk" <peter.van.dijk@powerdns.com>;

> neither the original text or the erratum suggest dropping queries with
> capital letters. The original text already says that queries MUST (2119
> capital) match uppercase letters to lowercase letters. The suggested
> erratum (in my eyes unnecessarily) suggests uppercasing a lowercase
> should to make this even more explicit.
> 
> As for devices dropping this, I don’t have any documentation handy but
> mixed case is certainly known to trigger bugs in various pieces of
> software now and then.

I was, in fact, being aghast at this:

>>> Some authoritative DNS servers and/or mitigation devices/software
>>> silently drop queries that have uppercase letters in them.

If there are authoritative zone servers that drop incoming queries with capital
letters in them, I wish someone would let me know where so that I can go set 
them on fire.  That's *terribly* antisocial, aside from violating the RFCs to a
fare-thee-well.

My apologies for being insufficiently clear about what I was responding to.

Cheers,
-- jra
-- 
Jay R. Ashworth                  Baylink                       jra@baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates       http://www.bcp38.info          2000 Land Rover DII
St Petersburg FL USA      BCP38: Ask For It By Name!           +1 727 647 1274