Re: [DNSOP] Another look - draft-ietf-dnsop-attrleaf-05.txt

Paul Vixie <paul@redbarn.org> Thu, 29 March 2018 21:06 UTC

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Date: Thu, 29 Mar 2018 14:06:30 -0700
From: Paul Vixie <paul@redbarn.org>
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To: Warren Kumari <warren@kumari.net>
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Subject: Re: [DNSOP] Another look - draft-ietf-dnsop-attrleaf-05.txt
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you do not need to document what won't work. underscored names don't 
match the syntax for host names. that's deliberate. that's why they were 
created. most dns servers will allow you to associate A or AAAA rrsets 
with underscored names, though some might warn you about it when parsing 
the zone file. some getaddrinfo() or gethostbyname() libraries will look 
up A or AAAA rrsets for these names, but many will not.

see RFC 952.