Re: Software to test MAC address privacy

On 19/07/2014 Robert Moskowitz wrote:
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

Hello Robert,

Not all locally-assigned addresses are available for use as random MAC addresses. Last I looked that are 
historical uses of LAS for DECnet and other protocols from 00:… through to 05:…. It would be useful if the 
IEEE recommended a range of LAS for host use (ie, virtual machine MAC addresses) and specified a range for 
your random MAC address proposal. Such a range should leave sufficient LAS for other potential future 

Regards, glen

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