Michael, I hadn't fully understood your comment on Friday. I do now, thanks. Thomas
On Fri, Apr 22, 2016 at 7:06 PM, Prof. Diego Dujovne < [email protected]> wrote: > Michael, > Thank you! > > Diego > > 2016-04-22 14:02 GMT-03:00 Michael Richardson <[email protected]>: > >> >> Pascal Thubert (pthubert) <[email protected]> wrote: >> > * Michael: Layer3 (meaning and above NOTNT) Only one per >> > packet. Payload is >> > already 1000 bytes layer 2 on every packet. not reduce layer 2 >> security, >> > repeat it on every fragment. Cannot eliminate in that layer. >> >> To clarify. >> >> If one has a 1000 byte CoAP packet, split up into 8 layer-2 fragments, the >> layer-3 security will be applied once. So the overhead of the layer-3 >> security may be much lower *on average* than the layer-2 security. >> >> The layer-2 security will get repeated on each of the 8 layer-2 fragments. >> It would be wonderful if that layer-3 security could be used to eliminate >> the >> overhead of the layer-2 security, but that would open up our LLNs to being >> used to carry bogus traffic. >> >> (The OSCOAP layer-3 security can not be checked on a hop-by-hop basis >> without >> sharing the session key everywhere) >> >> Obviously, if one has an 80-byte CoAP packet, this calculation is not the >> same. >> >> -- >> Michael Richardson <[email protected]>, Sandelman Software Works >> -= IPv6 IoT consulting =- >> >> >> >> >> _______________________________________________ >> 6tisch mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/6tisch >> >> > > > -- > DIEGO DUJOVNE > Académico Escuela de Ingeniería en Informática y Telecomunicaciones > Facultad de Ingeniería UDP > www.ingenieria.udp.cl > (56 2) 676 8125 > > _______________________________________________ > 6tisch mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/6tisch > > -- _______________________________________ Thomas Watteyne, PhD Research Scientist & Innovator, Inria Sr Networking Design Eng, Linear Tech Founder & co-lead, UC Berkeley OpenWSN Co-chair, IETF 6TiSCH www.thomaswatteyne.com _______________________________________
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