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Re: [DNSOP] Benjamin Kaduk's Discuss on draft-ietf-dnsop-session-signal-12: (with DISCUSS and COMMENT)

Ted Lemon <mellon@fugue.com> Wed, 01 August 2018 13:54 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Wed, 01 Aug 2018 09:54:45 -0400
In-Reply-To: <2D7288D8-A26B-4703-8710-FCFB23F27F33@kuehlewind.net>
Cc: Tom Pusateri <pusateri@bangj.com>, Tim Wicinski <tjw.ietf@gmail.com>, dnsop WG <dnsop@ietf.org>, dnsop-chairs <dnsop-chairs@ietf.org>, The IESG <iesg@ietf.org>, draft-ietf-dnsop-session-signal@ietf.org, Benjamin Kaduk <kaduk@MIT.EDU>
To: "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>
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Subject: Re: [DNSOP] Benjamin Kaduk's Discuss on draft-ietf-dnsop-session-signal-12: (with DISCUSS and COMMENT)
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On Aug 1, 2018, at 7:17 AM, Mirja Kuehlewind (IETF) <ietf@kuehlewind.net> wrote:
> Might not hurt to also just mention this in the doc as a reminder for the reader...

Good point.  I have made the following change:

 The format for DSO messages
 ({{format}}) differs somewhat from the traditional DNS message
 format used for standard queries and responses.
 The standard twelve-byte header is used, but the four count fields
 (QDCOUNT, ANCOUNT, NSCOUNT, ARCOUNT) are set to zero and accordingly their
 corresponding sections are not present.
+
 The actual data pertaining to DNS Stateful Operations
 (expressed in TLV syntax) is appended to the end of the DNS message header.
+The stream protocol carrying the DSO message frames it with 16-bit message length, so
+the length of the DSO data is determined from that length, rather than from any of
+the DNS header counts.
+
 When displayed using packet analyzer tools that have not been
 updated to recognize the DSO format, this
 will result in the DSO data being displayed

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