<div dir="ltr">Danny Cohen, Jon Postel and David Reed (MIT) all press for the IP split and creation of UDP. Also, add to packet voice, packet video - Steve Casner at ISI worked on both. <div><br></div><div>Keep in mind that the Internet layer sat on top of a bunch of independent networks whose performance properties varied greatly. The satellite net had a synchronous satellite round trip delay; packet radio was variable and lossy; ethernet was fast but potentially lossy, ARPANET was slow (50 kb/s) but fairly reliable. So the IP and TCP mechanisms had to work for a range of operating points. </div><div><br></div><div>Some of the rationale for various choices can be found in published papers. The SNMP choice came from a contentious three-alternative debate that was resolved and written up as an RFC. IENs were melded into RFCs eventually as the Internet went from an experiment to something we indnded to rely upon. The first TCP spec was published as an IEN and as RFC 675 if memory serves. Jack's summary of the rapid shifts led to the TCP/IP split of TCP/IP v3 and TCP/IP v4. Note we even tried IPv5 for streaming but abandoned as it did not seem to scale well. </div><div><br></div><div>v</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Feb 10, 2017 at 1:09 AM, Stephen Casner <span dir="ltr"><<a href="mailto:casner@acm.org" target="_blank">casner@acm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Thu, 9 Feb 2017, Jack Haverty wrote:<br>
<br>
> TCP isn't the best choice for voice. Various ARPA projects (e.g., Steve<br>
> Casner's work at ISI) wanted to experiment with voice coding and<br>
> protocols, but it wouldn't work well over TCP.<br>
><br>
> That was one motivation for the splitting apart of TCP and IP; it<br>
> permitted UDP to ride on top of IP in parallel with TCP.<br>
<br>
</span>Credit Danny Cohen for that push, sparked by Bob Kahn's support of the<br>
packet voice idea.<br>
<br>
-- Steve<br>
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