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 applications.

Regards, glen
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