I wonder if anyone else has read and understood this. I have read it, but, pdf of a slide show that it is, I could not claim to understand it - perhaps there is text available that would make it clearer. I do see the bit that is like the old, IP, Classful address structure, that the IETF tried and found wanting, but what that classful structure is actually used for (and whether or not it will be found wanting), I cannot tell. Tom Petch ----- Original Message ----- From: "IAB Chair" <iab-chair@xxxxxxx> To: <ietf-announce@xxxxxxxx> Sent: Thursday, December 13, 2012 3:37 AM Subject: Feedback Requested: Proposed IEEE RAC OUI Tier Restructuring The IEEE Registration Authority Committee (RAC) has requested IETF feedback on a proposal for restructuring of the Organizational Unique Identifier (OUI) within the IEEE 802 Medium Access Control (MAC) Address. Information on the proposal is available here: http://www.ietf.org/iesg/ieee/20120725/RAC_Virtualization_July2012.pdf http://ieee802.org/secmail/msg15524.html Comments should be sent to Glenn Parsons <gparsons@xxxxxxxx> and cc’d to iab@xxxxxxx.