1. doc.: IEEE 802.11-10/0873r0 Submission July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 1 Effectiveness of Reduction of Message Exchanges Date: 2010-07-14 Authors: NameCompanyAddressPhoneemail Hiroki NAKANOTrans New Technology, Inc. Sumitomo-Seimei Kyoto Bldg. 8F, 62 Tukiboko-cho Shimogyo-ku, Kyoto 600-8492 JAPAN +81-75-213-1200cas.nakano@gmai l.com cas@trans-nt.com Hitoshi MORIOKAROOT Inc.#33 Ito Bldg. 2-14-38 Tenjin, Chuo-ku, Fukuoka 810-0001 JAPAN +81-92-771-7630hmorioka@root- hq.com Hiroshi MANOROOT Inc.8F TOC2 Bldg. 7-21-11 Nishi- Gotanda, Shinagawa-ku, Tokyo 141-0031 JAPAN +81-3-5719-7630hmano@root- hq.com Marc EmmelmannFOKUSKaiserin-Augusta-Allee 31 10589 Berlin GERMANY +49-30-3463 7268 emmelmann@ieee.org

2. doc.: IEEE 802.11-10/0873r0 Submission Significant comments to FIA Proposed idea and scope – Reducing the number of massage exchange of association and authentication. Comment –Is this enough effective to reduce the total link set up time? –Should we consider the reduction of the number of exchanges of the higher layer? July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 2

3. doc.: IEEE 802.11-10/0873r0 Submission July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 3 STA AP EAPOL-Start EAP-Success PEAP EAP-MSCHAPv2 (4 round trip) Establishing TLS tunnel for PEAP (3 round trip) EAP-Identity (1 round trip) Association (1 round trip) Authentication (1 round trip) EAPOL-Key (2 round trip) Probe (1 round trip) EAPOL-Start (0.5round trip) EAPOL-Success (0.5round trip) DHCP (2 round trip) 1/16 = 6.25% 2/16 = 12.5% 11/16 = 68.75% 2/16=12.5% Most of message exchanges are consumed for Authentication and Association.

4. doc.: IEEE 802.11-10/0873r0 Submission How many roundtrips do messages go? PEAPv0 / EAP-MSCHAPv2 EAP-FASTTarget of FIA 802.11 Probe Req./Resp.111 802.11 Auth. Req./Resp.11 1 802.11 Assoc. Req./Resp.11 EAPOL-Start0.5 TLS tunnel establishment43 EAP-Identity Req./Resp.11 EAP-MSCHAPv222 EAP-Extension Req./Resp.11 EAP-Success0.5 EAPOL-Key handshake22 IPv4 DHCP222 Total1615 4 July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 4 75% off!

5. doc.: IEEE 802.11-10/0873r0 Submission Other considerations Channel scan sometimes employs a few seconds. –This is an implementation issue. –An STA having multiple channel radio can do for a couple of milliseconds. DHCP for IPv4 sometimes employs a few seconds. –This is another implementation issue. –An STA can send DHCPREQUEST as soon as receive the first DHCPOFFER. This enables STA to complete DHCP process in a few 10 milliseconds without any violation against RFC2131 (Dynamic Host Configuration Protocol). July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 5

6. doc.: IEEE 802.11-10/0873r0 Submission Collaboration with DHCP Pure 802.11Collaborate with DHCP 802.11 Probe Req./Resp.11 FIA Auth. and Key Dist.1 1 IPv4 DHCP2 Total42 July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 6 If 802.11 provides mechanism transferring data to assign an IP address during process of 802.11, total message exchanges are reduced moreover. –But this is a minor problem. 50% off!

7. doc.: IEEE 802.11-10/0873r0 Submission Conclusion Question –Is this enough effective to reduce the total link set up time? –Should we consider the reduction of the exchange number of the higher layer? Answer –During setting up link, most time-consuming part is “Authentication and key distribution.” –FIA tries to shorten the very part. –If 802.11 helps its upper layer, things get better. July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 7

8. doc.: IEEE 802.11-10/0873r0 Submission Questions and Comments? July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 8

9. doc.: IEEE 802.11-10/0873r0 Submission July 2010 Hiroki Nakano, Trans New Technology, Inc.Slide 9