1. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 1 WAVE Random MAC Address Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdfstuart.kerry@philips.compatcom@ieee.org Date: 2005-01-17 Authors:

2. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 2 Abstract Questions have been raised since the November regarding a WAVE OBU changing its MAC address to preserve anonymity. This has been investigated and found to be in compliance with the existing 802.11 standard as well as address registration procedures. The 11p draft will retain reference to such MAC address changes, leaving the determination of when and how to perform such changes the responsibility of IEEE P1609 (upper layers standard)

3. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 3 Anonymity concerns A fixed MAC address would allow any given vehicle to be tracked wherever it goes –Lack of privacy from anyone with a receiver –“Big Brother” perceptions could never be alleviated –Automatic speeding tickets Some are in favor of them, but drivers who speed are the ones we need to encourage to keep safety equipment connected The primary purpose of 802.11p technology is to warn other drivers/vehicles Lack of anonymity would discourage the public from using these devices –Vehicle manufacturers would no longer support program –Drivers would disable devices –Loss of public safety benefits

4. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 4 Reference IEEE 802.11-1999, page 360 "A locally-administered MAC address may be used in lieu of the unique, globally-administered MAC address assigned to the station. However, the value of dot11MacAddress may not change during MAC operation."

5. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 5 Concerns expressed since November All MAC addresses must be registered with RAC –Not the case for locally administered addresses as we use for OBUs –RSUs use fixed globally registered addresses All MAC addresses must be unique globally (thus leading to the need for registration) –Only a problem if OBU data frames are bridged to another 802 network that also uses locally administered MAC addresses –Bridges must understand the operation of the networks that they interconnect. Placing a warning on 802.11p bridging is a small price to achieve user acceptance.

6. doc.: IEEE 802.11-05/1628r1 Submission January 2005 Lee Armstrong, Armstrong Consulting, Inc.Slide 6 Current plan OBU MAC address will be changed periodically under the direction of the WAVE Management Entity defined in IEEE P1609.3 OBU MAC addresses will be locally and not globally administered