<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 02/01/2008, at 2:10 PM, Bevan Slattery wrote:</div><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div class="Section1"><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; color: black; "><font class="Apple-style-span" face="Helvetica" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br class="webkit-block-placeholder"></span></font></div><div style="margin-top: 0cm; margin-right: 0cm; margin-left: 0cm; margin-bottom: 0.0001pt; font-size: 12pt; font-family: 'Times New Roman'; color: black; "><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy; ">Are you suggesting that with the current P2P caching systems out there they can’t determine the file (or portion thereof) from the flows so it can provide a locally cached copy of it? Seriously? Then how does a P2P caching system work? It just inserts some locally cached content randomly in the hope that it’s the same as being sought? Of course not. Based upon flows it can identify what is actually being transmitted and then it substitute it’s local copy.</span></font></div></div></div></span></blockquote><div><br></div><div>P2P caching systems work by looking at the hashes requested by</div><div>the client.</div><div><br class="webkit-block-placeholder"></div><div>They don't look at the file content, or the file ID, or the p2p data plane</div><div>flows. They just look at the hash of the block the client is looking for</div><div>on the p2p app's control plane.</div><div><br class="webkit-block-placeholder"></div><div>If they can't see the hash request stream (because, for example, it's</div><div>encrypted, or because the user has instructed their client to filter the</div><div>address of the cache) they can't do anything at all.</div><div><br></div><div><br class="webkit-block-placeholder"></div><div><br class="webkit-block-placeholder"></div><div> - mark</div></div><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><font class="Apple-style-span" face="'Andale Mono'" size="1"><span class="Apple-style-span" style="font-size: 9px; "><br class="Apple-interchange-newline">--</span></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="'Andale Mono'"><font class="Apple-style-span" size="1"><span class="Apple-style-span" style="font-size: 9px; ">Mark Newton Email: <a href="mailto:newton@internode.com.au">newton@internode.com.au</a> (W)</span></font></font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="'Andale Mono'"><font class="Apple-style-span" size="1"><span class="Apple-style-span" style="font-size: 9px; ">Network Engineer Email: <a href="mailto:newton@atdot.dotat.org">newton@atdot.dotat.org</a> (H)</span></font></font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="'Andale Mono'"><font class="Apple-style-span" size="1"><span class="Apple-style-span" style="font-size: 9px; ">Internode Systems Pty Ltd Desk: +61-8-82282999</span></font></font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="'Andale Mono'"><font class="Apple-style-span" size="1"><span class="Apple-style-span" style="font-size: 9px; ">"Network Man" - Anagram of "Mark Newton" Mobile: +61-416-202-223</span></font></font></font></div><div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="'Andale Mono'"><font class="Apple-style-span" size="1"><span class="Apple-style-span" style="font-size: 9px; "><br class="webkit-block-placeholder"></span></font></font></font></div></div></div></span><br class="Apple-interchange-newline"></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"> </div><br></body></html>