<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jul 29, 2016, at 3:20 AM, Nour El Houda Ben Youssef <<a href="mailto:NourElHouda.BenYoussef@wevioo.com" class="">NourElHouda.BenYoussef@wevioo.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Courier; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Yes indeed I already checked this thread<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Yet too many aspects still fuzzy<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">First of all, we know that each layer in the Internet protocol Suite causes its overhead which why we talk about control overhead, signaling overhead, etc<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">With NDN Interest packets or nacks are considered as which overhead exactly<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">Second, as I tried to experiment NFD, I noticed that I’m able only to use NDN as an overlay network on top of udp or TCP… So for my overhead: would it be the Internet protocol suite overheads in addition to ndn overhead (interests and nacks)?</span></div></div></div></blockquote><div><br class=""></div>(I would not call NACK as overhead -- one could do without NACK, just that leaves failure/problem detection to timeout, which can significantly impact performance)</div><div><br class=""></div><div>regarding whether NDN runs over tunnels, one should separates the design from the code available today.</div><div><br class=""></div><div>1/ By design, NDN can run over anything that can do datagram delivery, bluetooth, wifi, any layer 2 links, and any tunnels at any levels.</div><div><br class=""></div><div>2/ in terms of code: I believe one can run directly over wifi and ethernet; we did NDN over bluotooth a few years back, but I dont think that old code still works with the new NFD.</div><div><br class=""></div><div>But to travel far (cross many routers that only know IP), one needs to use tunnels. this is similar to early days of IP: during my early years of grad school, IP ran over ethernet locally, but to go far it had to either use telephone dialup, or go through leased lines from phone companies (Arpanet). </div><div><br class=""></div><div>Here is a short interview article that seems relevant to your interest and you might want to take a look:</div><div><a href="http://web.cs.ucla.edu/~lixia/papers/1603login_interview.pdf" class="">http://web.cs.ucla.edu/~lixia/papers/1603login_interview.pdf</a></div><div><br class=""></div><div>Lixia</div></body></html>