<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
        {font-family:Wingdings;
        panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
        {font-family:"Cambria Math";
        panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
        {font-family:Aptos;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0cm;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:blue;
        text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
        {mso-style-priority:34;
        margin-top:0cm;
        margin-right:0cm;
        margin-bottom:0cm;
        margin-left:36.0pt;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
p.m-2940071027920571956msolistparagraph, li.m-2940071027920571956msolistparagraph, div.m-2940071027920571956msolistparagraph
        {mso-style-name:m_-2940071027920571956msolistparagraph;
        mso-margin-top-alt:auto;
        margin-right:0cm;
        mso-margin-bottom-alt:auto;
        margin-left:0cm;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
p.m-2940071027920571956m128766250028595583msolistparagraph, li.m-2940071027920571956m128766250028595583msolistparagraph, div.m-2940071027920571956m128766250028595583msolistparagraph
        {mso-style-name:m_-2940071027920571956m128766250028595583msolistparagraph;
        mso-margin-top-alt:auto;
        margin-right:0cm;
        mso-margin-bottom-alt:auto;
        margin-left:0cm;
        font-size:11.0pt;
        font-family:"Calibri",sans-serif;}
span.m-2940071027920571956gmailsignatureprefix
        {mso-style-name:m_-2940071027920571956gmailsignatureprefix;}
span.EmailStyle24
        {mso-style-type:personal-reply;
        font-family:"Calibri",sans-serif;
        color:windowtext;}
.MsoChpDefault
        {mso-style-type:export-only;
        font-size:10.0pt;
        mso-ligatures:none;}
@page WordSection1
        {size:612.0pt 792.0pt;
        margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
        {page:WordSection1;}
/* List Definitions */
@list l0
        {mso-list-id:923147096;
        mso-list-template-ids:-1958312258;}
@list l0:level1
        {mso-level-tab-stop:36.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level2
        {mso-level-tab-stop:72.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level3
        {mso-level-tab-stop:108.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level4
        {mso-level-tab-stop:144.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level5
        {mso-level-tab-stop:180.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level6
        {mso-level-tab-stop:216.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level7
        {mso-level-tab-stop:252.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level8
        {mso-level-tab-stop:288.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l0:level9
        {mso-level-tab-stop:324.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1
        {mso-list-id:1106534235;
        mso-list-template-ids:-314555894;}
@list l1:level1
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:36.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level2
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:72.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level3
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:108.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level4
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:144.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level5
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:180.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level6
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:216.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level7
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:252.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level8
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:288.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l1:level9
        {mso-level-number-format:alpha-upper;
        mso-level-tab-stop:324.0pt;
        mso-level-number-position:left;
        text-indent:-18.0pt;}
@list l2
        {mso-list-id:1915242657;
        mso-list-type:hybrid;
        mso-list-template-ids:-2121886494 1282996710 67567619 67567621 67567617 67567619 67567621 67567617 67567619 67567621;}
@list l2:level1
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Symbol;
        mso-fareast-font-family:Calibri;
        mso-bidi-font-family:"Times New Roman";}
@list l2:level2
        {mso-level-number-format:bullet;
        mso-level-text:o;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:"Courier New";}
@list l2:level3
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Wingdings;}
@list l2:level4
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Symbol;}
@list l2:level5
        {mso-level-number-format:bullet;
        mso-level-text:o;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:"Courier New";}
@list l2:level6
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Wingdings;}
@list l2:level7
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Symbol;}
@list l2:level8
        {mso-level-number-format:bullet;
        mso-level-text:o;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:"Courier New";}
@list l2:level9
        {mso-level-number-format:bullet;
        mso-level-text:;
        mso-level-tab-stop:none;
        mso-level-number-position:left;
        text-indent:-18.0pt;
        font-family:Wingdings;}
ol
        {margin-bottom:0cm;}
ul
        {margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="DE" link="blue" vlink="purple" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">In the abstract, I’d say so, but (let’s be honest) many developers tend to ignore the abstract notion of the service interface and prefer to have a tangible set of API operations.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Jeremy<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Felix Flentge <Felix.Flentge@esa.int>
<br>
<b>Sent:</b> Montag, 11. März 2024 11:46<br>
<b>To:</b> sburleig.sb@gmail.com; Mayer, Jeremy <Jeremy.Mayer@dlr.de>; vint@google.com<br>
<b>Cc:</b> sis-dtn@mailman.ccsds.org<br>
<b>Subject:</b> BP Sockets [was RE: [Sis-dtn] IP networking within DTN-based protocol architectures]<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">I like the idea but isn’t this already covered (partially) by the CCSSDS BP service interface, eg:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]>Bind – register EID in passive state<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Listen – </span>register EID in active state<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Connect – sets a default destination for future send.request<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Send – send.request <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Recv – poll.request<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-GB">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Felix<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>sburleig.sb--- via SIS-DTN<br>
<b>Sent:</b> Saturday, March 9, 2024 6:56 PM<br>
<b>To:</b> <a href="mailto:Jeremy.Mayer@dlr.de">Jeremy.Mayer@dlr.de</a>; <a href="mailto:vint@google.com">
vint@google.com</a><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [Sis-dtn] IP networking within DTN-based protocol architectures<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US" style="font-family:"Aptos",sans-serif">Thanks for that analysis, Jeremy.  We’ve been talking about at least since STINT several years ago, and I really think it’s an idea whose time has come.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US" style="font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US" style="font-family:"Aptos",sans-serif">Scott<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US" style="font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US">
<a href="mailto:Jeremy.Mayer@dlr.de">Jeremy.Mayer@dlr.de</a> <<a href="mailto:Jeremy.Mayer@dlr.de">Jeremy.Mayer@dlr.de</a>>
<br>
<b>Sent:</b> Saturday, March 9, 2024 8:01 AM<br>
<b>To:</b> <a href="mailto:vint@google.com">vint@google.com</a>; <a href="mailto:sburleig.sb@gmail.com">
sburleig.sb@gmail.com</a><br>
<b>Cc:</b> <a href="mailto:Tomaso.deCola@dlr.de">Tomaso.deCola@dlr.de</a>; <a href="mailto:sis-dtn@mailman.ccsds.org">
sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> RE: [Sis-dtn] IP networking within DTN-based protocol architectures<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Hi,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">That’s a fair point. Generally, I’d say that BP-POSIX could work with the following:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Bind – works: sets source EID.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Listen – works; sets source EID and opens reception.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Connect – UDP style, sets default destination address.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Send – only valid for connected bundlesocks.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Sendto/sendmsg – works.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Recv – works.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Recvfrom/recvmsg – works, probably should support “wildcard” EIDs, at least for services.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Getaddrinfo and friends – not required<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="EN-GB" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">       
</span></span></span><![endif]><span lang="EN-GB">Select – Works, highly implementation dependent.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">BSD sockets really do work for everything!<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Jeremy<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Vint Cerf <<a href="mailto:vint@google.com">vint@google.com</a>>
<br>
<b>Sent:</b> Samstag, 9. März 2024 16:51<br>
<b>To:</b> Scott Burleigh <<a href="mailto:sburleig.sb@gmail.com">sburleig.sb@gmail.com</a>><br>
<b>Cc:</b> Mayer, Jeremy <<a href="mailto:Jeremy.Mayer@dlr.de">Jeremy.Mayer@dlr.de</a>>; de Cola, Tomaso <<a href="mailto:Tomaso.deCola@dlr.de">Tomaso.deCola@dlr.de</a>>; Dr. Keith L Scott via SIS-DTN <<a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a>><br>
<b>Subject:</b> Re: [Sis-dtn] IP networking within DTN-based protocol architectures<o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-left:36.0pt">Yes generally speaking<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="margin-left:36.0pt">On Sat, Mar 9, 2024, 10:43 <<a href="mailto:sburleig.sb@gmail.com">sburleig.sb@gmail.com</a>> wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US" style="font-family:"Aptos",sans-serif">I think we get closer to BSD/POSIX if we use UDP as a model.  The attenuated UDP notion of connect() would work for BP, I think.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US" style="font-family:"Aptos",sans-serif"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US" style="font-family:"Aptos",sans-serif">Scott</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US" style="font-family:"Aptos",sans-serif"> </span><span lang="EN-US"><o:p></o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org" target="_blank">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Jeremy Mayer via SIS-DTN<br>
<b>Sent:</b> Saturday, March 9, 2024 12:35 AM<br>
<b>To:</b> <a href="mailto:vint@google.com" target="_blank">vint@google.com</a>; <a href="mailto:Tomaso.deCola@dlr.de" target="_blank">
Tomaso.deCola@dlr.de</a><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [Sis-dtn] IP networking within DTN-based protocol architectures<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">Hi,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">I’m tempted to agree. I’ve seen limited utility in IP->BP encap, as (other than some unidirectional UDP-based applications), the assumptions made in IP networks (especially TCP) do not scale well to DTN environments. The two largest issues
 I see are:</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="m-2940071027920571956msolistparagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">A.<span style="font:7.0pt "Times New Roman"">     
</span></span></span><![endif]><span lang="EN-GB">The assumption that relatively low-latency and bidirectional communication is available.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="m-2940071027920571956msolistparagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">B.<span style="font:7.0pt "Times New Roman"">     
</span></span></span><![endif]><span lang="EN-GB">The layering of stream and message-based semantics.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">Almost every TCP-ish application which I’ve seen run over BP winds up with exceptionally low performance, unless some sort of PEP is integrated, which adds complexity, failure points, and fragility.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">+1 for the notion of a standard API though, with the additional caveat that we should standardize nomenclature across implementations. We could likely reuse about 80% of the BSD/POSIX interface for BP, with the notable exception of connect.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">Thanks,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB">Jeremy</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-GB"> </span><span lang="EN-US"><o:p></o:p></span></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<b><span lang="EN-US">From:</span></b><span lang="EN-US"> SIS-DTN <<a href="mailto:sis-dtn-bounces@mailman.ccsds.org" target="_blank">sis-dtn-bounces@mailman.ccsds.org</a>>
<b>On Behalf Of </b>Vint Cerf via SIS-DTN<br>
<b>Sent:</b> Freitag, 8. März 2024 12:31<br>
<b>To:</b> de Cola, Tomaso <<a href="mailto:Tomaso.deCola@dlr.de" target="_blank">Tomaso.deCola@dlr.de</a>><br>
<b>Cc:</b> <a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [Sis-dtn] IP networking within DTN-based protocol architectures<o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
The more I think about this, the less I like trying to manage off-Earth IP networks remotely. I think I would much rather see native applications running over BP. In any case we need to develop standard APIs for BP, such as the Sockets interface for Linux/Unix/Posix. <span lang="EN-US"><o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
We do need to figure out how IP-based and BP-based applications interwork. What do Domain Names mean in the BP context for example. <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
v<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
On Fri, Mar 8, 2024 at 4:24 AM Tomaso de Cola via SIS-DTN <<a href="mailto:sis-dtn@mailman.ccsds.org" target="_blank">sis-dtn@mailman.ccsds.org</a>> wrote:<span lang="EN-US"><o:p></o:p></span></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
Dear All,<span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">as mentioned yesterday during our DTN weekly, during the past Fall meeting a presentation was given by University of Nanjing with the support of Chinese agency about IP-networking within DTN-based protocol stacks, especially for planetary
 network segments (i.e. what is often referred to as IP-islands). <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">The link to that presentation is as follows:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"><a href="https://cwe.ccsds.org/sis/docs/SIS-DTN/Meeting%20Materials/2023/Fall%202023%20SIS-DTN/Possible%20BOF%20Discussion.pptx?d=w44d31f0b3be649e4bf24ec4ae50479a1" target="_blank">https://cwe.ccsds.org/sis/docs/SIS-DTN/Meeting%20Materials/2023/Fall%202023%20SIS-DTN/Possible%20BOF%20Discussion.pptx?d=w44d31f0b3be649e4bf24ec4ae50479a1</a><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">The proposal made there was for a BOF (i.e. towards a WG formation), which I see however too premature. On the contrary, I’d be more in favour for a SIG (Special Interest Group), happening outside the DTN WG.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">As discussed yesterday, key points to clarify/agree are:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="m-2940071027920571956m128766250028595583msolistparagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo6">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">     
</span></span></span><![endif]><span lang="EN-US">Is the proposal sound and meaningful to be addressed?<o:p></o:p></span></p>
<p class="m-2940071027920571956m128766250028595583msolistparagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo6">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">     
</span></span></span><![endif]><span lang="EN-US">Is appropriate for the SIS area or should be better addressed at architectural level in SEA (maybe it can be even a cross-area initiative)?<o:p></o:p></span></p>
<p class="m-2940071027920571956m128766250028595583msolistparagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo6">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">     
</span></span></span><![endif]><span lang="EN-US">In the case of SIS, is there significant support to start this? In other words, which agencies have interest in contributing to this activity?<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">Thank you for sharing comments/objections/suggestions.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">Have a nice weekend,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US">Tomaso<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">————————————————————————</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif">
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">Deutsches Zentrum für Luft- und Raumfahrt</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray"> (DLR)</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">German Aerospace Center</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">Institute of Communications and Navigation | Satellite Networks | Oberpfaffenhofen | 82234 Wessling | Germany</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D">
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<b><span lang="IT" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">Tomaso de Cola, Ph.D.</span></b><span lang="IT" style="color:#1F497D"> |
</span><b><span lang="IT" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">Integrated Satellite Systems (INS) Team Leader<br>
</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:dimgray">Telefon
<a href="tel:+49%208153%20282156" target="_blank">+49 8153 28-2156</a> | Telefax 
<a href="tel:+49%208153%20282844" target="_blank">+49 8153 28-2844</a> |</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">
</span><span lang="EN-US" style="color:#1F497D"><a href="mailto:sandro.scalise@dlr.de" target="_blank"><span lang="DE" style="font-size:10.0pt;font-family:"Arial",sans-serif">tomaso.decola@dlr.de</span></a></span><span style="color:#1F497D">
<br>
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><a href="http://www.dlr.de/kn/institut/abteilungen/san" target="_blank"><span lang="DE">http://www.dlr.de/kn/institut/abteilungen/san</span></a></span><span lang="EN-US" style="color:#1F497D">
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
_______________________________________________<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://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-dtn" target="_blank">https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-dtn</a><span lang="EN-US"><o:p></o:p></span></p>
</div>
</blockquote>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<br clear="all">
<span lang="EN-US"><o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
<span class="m-2940071027920571956gmailsignatureprefix">-- </span><span lang="EN-US"><o:p></o:p></span></p>
<div>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
Please send any postal/overnight deliveries to:<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
Vint Cerf<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
Google, LLC<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
1900 Reston Metro Plaza, 16th Floor<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
Reston, VA 20190<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
+1 (571) 213 1346<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
until further notice<span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
 <span lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><span lang="EN-GB">This message is intended only for the recipient(s) named above. It may contain proprietary information and/or protected content. Any unauthorised disclosure, use, retention or dissemination is prohibited. If you have
 received this e-mail in error, please notify the sender immediately. ESA applies appropriate organisational measures to protect personal data, in case of data privacy queries, please contact the ESA Data Protection Officer (<a href="mailto:dpo@esa.int">dpo@esa.int</a>).
<o:p></o:p></span></p>
</div>
</body>
</html>