On Aug 1, 2018, at 7:17 AM, Mirja Kuehlewind (IETF) <[email protected]> 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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