Re: Software to test MAC address privacy

[Robert Moskowitz <rgm htt-consult com>]

On 07/18/2014 11:02 AM, Stuart Gathman wrote:
> On 07/17/2014 09:05 PM, Robert Moskowitz wrote:
> > draft-ietf-6man-ipv6-address-generation-privacy-01.txt
> >
> > privacy for both global and local scope IPv6 addresses.
> >
> > So how do I get interest in this effort and get some revised test app 
> > for me (and other Linux users) to participate?
> To guarantee compatibility, the first few bits should mark the MAC as 
> a "private" one, and not conflict with any vendor id or pseudo vendor 
> (like statically generated MACs for virtual machine virtual network 
> interfaces).

Actually the standard uses the first 2 bits for this. It is called local 
scope MAC addresses. This leaves 46 bits for the random content. Thus if 
you have a network of 10000 devices the probablity of a collision is 7x10^-7

And some SOC ARM cards do not have an eeprom so the software install has 
to create a MAC address. My Cubieboard is one such.