Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-resolver-information-01.txt

"Niall O'Reilly" <niall.oreilly@ucd.ie> Mon, 17 February 2020 11:41 UTC

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From: Niall O'Reilly <niall.oreilly@ucd.ie>
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To: Paul Hoffman <paul.hoffman@icann.org>
Cc: Robert Mortimer <robm=40scramworks.net@dmarc.ietf.org>, dnsop@ietf.org
Date: Mon, 17 Feb 2020 11:41:53 +0000
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-resolver-information-01.txt
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On 12 Feb 2020, at 16:48, Paul Hoffman wrote:

> Good call. Would it make both parts clearer if the introduction 
> instead said:
>
>    Because the information returned in this protocol only applies to 
> recursive
>    resolvers, servers that are acting as both authoritative servers 
> and recursive
>    resolvers MUST only answer queries that are intended for the 
> recursive
>    resolver portion of the server. Servers that are only authoritative 
> servers
>    MUST NOT answer queries that are defined in this protocol.

It seems strange to me that this significant restriction is mentioned 
only in the Introduction.

I think that a clearer expression of the first case might be

   any server that can act as both an authoritative server and a 
recursive
   resolver MUST NOT answer queries that are defined in this protocol
   whenever it is acting as an authoritative server.

If this still seems to leave a contradiction, it may be worthwhile to 
view
the distinction as a property of the transaction, rather than of the 
"portion
of the server".  The server, if it receives a query for which it 
determines
that an authoritative answer is appropriate, must not answer as if it 
were
a recursive resolver.

Would it be useful to extend the protocol to include a signal for 
"Sorry: authoritative here"?

I hope some of this helps.

/Niall