<div dir="ltr">great example of the value of operational experience to achieve standardization<div>v</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 6, 2023 at 12:29 AM 구철회 via SIS-DTN <<a href="mailto:sis-dtn@mailman.ccsds.org">sis-dtn@mailman.ccsds.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2345218334797094992">
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<p class="MsoNormal"><span lang="EN-US">Hi Fellows<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Recently, I began to consider that the implementation of the TCP convergence layer, which conveys Bundles reliably, can be source of interoperability issues among various DTN implementations.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">There is freedom in designing the TCP interface, with options like allocating a single TCP port to a node and multiplexing neighbor input, or allocating multiple TCP ports for each neighbor's transaction input.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Some implementations perform an interrogation step to obtain multiplexing information from neighboring nodes, such as IPN/DTN address.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Some implementations prefer multiple TCP daemons for connecting with neighbors.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">In either case, DTN software may need to implement a specialized UTA or CLA interface for interfacing with various other DTN software via TCP convergence layer.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Is there a standardized way to do it? Or do we want to discuss about a standardized way here?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">On the contrary, LTP, as a Convergence Layer, is a straightforward mechanism and a point-to-point protocol that simplifies Bundle input multiplexing, resulting in fewer interoperability issues, in my opinion. LTPCL is
useful at the ground-space link, however TCPCL can be more suitable choice for terrestrial link. So, I think, TCPCL needs more attention for future DTN usage.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Best,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Cheol<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
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