<div dir="ltr">John and Dave Crocker are correct - adaptive routing was one of the important aspects of the ARPANET implementation. <div><br></div><div>The resilience theme in Baran's work and in the later Internet was born of concern for post-nuclear command and control. ARPANET was motivated by resource sharing as Larry Roberts and Barry Wessler clearly spelled out in their 1970 paper. Some on this list may remember that we used Packet Radios and Strategic Air Command aircraft to demonstrate around 1981-2 how a fragmented ARPANET could be reconstituted using TCP/IP, terrestrial and airborne packet radio and suitable routing mechanisms.<br><div><br></div><div>v</div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 13, 2015 at 1:34 PM, John Day <span dir="ltr"><<a href="mailto:jeanjour@comcast.net" target="_blank">jeanjour@comcast.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">ARPANET had adaptive routing from the start. <div><br></div><div>This question is more about what people were doing and thinking in the 1969-1971 time frame, not events almost 10 years or more later.</div><span class="HOEnZb"><font color="#888888"><div><br></div></font></span><div><span class="HOEnZb"><font color="#888888">John</font></span><div><div class="h5"><br><div><blockquote type="cite"><div>On Jan 13, 2015, at 13:21, Bill Ricker <<a href="mailto:bill.n1vux@gmail.com" target="_blank">bill.n1vux@gmail.com</a>> wrote:</div><br><div><div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 13, 2015 at 10:46 AM, John Day <span dir="ltr"><<a href="mailto:jeanjour@comcast.net" target="_blank">jeanjour@comcast.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I think the nuclear war meme is really more tightly associated with the Internet than the ARPANET. </blockquote></div><br><div class="gmail_default" style="font-family:georgia,serif">Hmm, that makes sense. </div><div class="gmail_default" style="font-family:georgia,serif">(D)ARPAnet initially had fixed routing, not useful in damage-prone environment.</div><div class="gmail_default" style="font-family:georgia,serif">It was TCP/IP that introduced adaptive routing around damage. </div><div class="gmail_default" style="font-family:georgia,serif">(USEnet evolved adaptive routing, i don't recall how that was related .)</div><div class="gmail_default" style="font-family:georgia,serif"><br></div><div class="gmail_default" style="font-family:georgia,serif">Also note that the Military nearly adopted the ISO OSI protocol stack not the TCP/IP Internet stack, even though DARPA had subsidized the (pre-Web/NSF/NSCC) development ! </div><div><br></div>-- <br><div><div dir="ltr">Bill Ricker<br><a href="mailto:bill.n1vux@gmail.com" target="_blank">bill.n1vux@gmail.com</a><div><a href="https://www.linkedin.com/in/n1vux" target="_blank">https://www.linkedin.com/in/n1vux</a> <br></div></div></div>
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