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<p class="MsoNormal">Thanks Vint and Keith. I think the approach makes sense and I agree with Vint. The SANA is defined to be apolitical and serving of all space comm needs. We even opened it up to registering non CCSDS link layer end-points for Cubesats
and 802.11 and 3GPPP MAC addresses as an alternative to CCSDS link layer Spacecraft identifiers. We have positioned CCSDS and the SANA to be an important registrar for space vehicles and their protocol suites.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Vint Cerf <vint@google.com><br>
<b>Date: </b>Friday, September 10, 2021 at 10:06 AM<br>
<b>To: </b>Keith Scott <a href="mailto:KSCOTT@mitre.org%20on-CCSDS"></a></span><span style="font-size:12.0pt"> <span style="color:black"><br>
<b>Cc: </b>Peter Shames <peter.m.shames@jpl.nasa.gov>, "sis-dtn@mailman.ccsds.org" <sis-dtn@mailman.ccsds.org><br>
<b>Subject: </b>[EXTERNAL] Re: [Sis-dtn] SANA-related question<o:p></o:p></span></span></p>
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<p class="MsoNormal">has strong parallels with ICANN's IANA and has worked well. As long as SANA is seen as apolitical and serving of all needs, it can work.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">v<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Sep 10, 2021 at 12:28 PM Dr. Keith L Scott <<a href="mailto:kscott@mitre.org">kscott@mitre.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hey,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So we’re working the revisions to the LTP spec, and one thing we’d like to do is to have a ‘field length identifer’ that serves (at least logically) as the index into a lookup table
that gives the lengths of a number of LTP header fields. So, for example field Length Identifier 1 could mean:<o:p></o:p></p>
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<li class="gmail-m-5160434411957112052msolistparagraph" style="mso-list:l0 level1 lfo1">
The Session ID is 1 byte long<o:p></o:p></li><li class="gmail-m-5160434411957112052msolistparagraph" style="mso-list:l0 level1 lfo1">
The Session Number is 3 bytes long<o:p></o:p></li><li class="gmail-m-5160434411957112052msolistparagraph" style="mso-list:l0 level1 lfo1">
The Offset fields in data segments are 4 bytes long<o:p></o:p></li><li class="gmail-m-5160434411957112052msolistparagraph" style="mso-list:l0 level1 lfo1">
Etc.<o:p></o:p></li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We believe that the ‘lookup table’ should be a SANA registry (we’re currently envisioning maybe a couple of ‘profiles’ e.g. for low- medium- and high-rate links).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I THINK we want to write the spec in such a way that we talk about the field length identifier and then say something like: “For field lengths determined by the field length identifier,
implementations MUST use the field length values from <insert SANA registry here>”.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Does this seem reasonable? Other thoughts / suggestions?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> v/r,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> --keith<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
SIS-DTN mailing list<br>
<a href="mailto:SIS-DTN@mailman.ccsds.org" target="_blank">SIS-DTN@mailman.ccsds.org</a><br>
<a href="https://urldefense.us/v3/__https:/mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-dtn__;!!PvBDto6Hs4WbVuu7!bUU38Kp1Br731s68lpMZWavSWSKsMHZQZBNFAivKf8lsLNV_GL9Cm2H3W8oljRCzOqsNCMBd$" target="_blank">https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-dtn</a><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Please send any postal/overnight deliveries to:<o:p></o:p></p>
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<p class="MsoNormal">Vint Cerf<o:p></o:p></p>
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<p class="MsoNormal">1435 Woodhurst Blvd <o:p></o:p></p>
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<p class="MsoNormal">McLean, VA 22102<o:p></o:p></p>
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<p class="MsoNormal">703-448-0965<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">until further notice<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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