[dbound] NXDomain (was: Re: [dmarc-ietf] Fwd: New Version Notification for draft-dcrocker-dns-perimeter-00.txt)

Dave Crocker <dhc@dcrocker.net> Sat, 06 April 2019 12:36 UTC

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Reply-To: dcrocker@bbiw.net
From: Dave Crocker <dhc@dcrocker.net>
Organization: Brandenburg InternetWorking
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Subject: [dbound] NXDomain (was: Re: [dmarc-ietf] Fwd: New Version Notification for draft-dcrocker-dns-perimeter-00.txt)
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>      if you ask for _perim.a.b.c.tld, and there is only _perim.c.tld,
> the DNS response will be an NXDOMAIN and I don't think that DNS clients 
> expect to find additional records in an NXDOMAIN response.


So indeed, this was an interesting point.

However from what I can tell, including Additional information in an 
NXDomain response is entirely legal, albeit certainly unusual.

My understanding is that it's likely careful use of a resolver library 
can retrieve the Additional information.  Some calls won't get it; 
others probably will.

The guidance for making this work is that it's seeking to emulate DNS 
wildcard behavior, through cooperative behavior by both the resolver and 
the authoritative server.

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net