Re: [DNSOP] Working Group Last Call for: draft-ietf-dnsop-attrleaf

Dave Crocker <> Mon, 25 June 2018 21:38 UTC

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To: Ray Bellis <>, John Levine <>
References: <20180625210807.7791A2888379@ary.local> <>
From: Dave Crocker <>
Organization: Brandenburg InternetWorking
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Date: Mon, 25 Jun 2018 11:38:17 -1000
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Subject: Re: [DNSOP] Working Group Last Call for: draft-ietf-dnsop-attrleaf
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On 6/25/2018 11:13 AM, Ray Bellis wrote:
> On 25/06/2018 22:08, John Levine wrote:
>> One minor point in attrleaf, is whether to mention the poor
>> interactions between _names and wildcards.  One issue is that
>> _blah.*.example doesn't work, the other is that *.example will match
>> underscored names which can be surprising if it has RRs of a type that
>> might be underscored, notably TXT.
> Isn't the issue with wildcards already well addressed in the IAB
> document on extending the DNS ?  (RFC 5507).

Yes, but...

This is certainly a universal issue with _names and it's one that seems 
not to be obvious to many folk.  So while the mathematics of purity 
should be satisfied that the issue is document somewhere, the 
probabilities of reader psychology might encourage some judicious 
redundancy.  And RFCs nicely permit pedagogy along with specification.

I'm feeling lazy.  Care to suggest text to add and its location in 
-attrleaf, John?


Dave Crocker
Brandenburg InternetWorking