On 08/03/2014 04:58 AM, Glen Turner wrote:
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.
This is actually in progress. We are forming a study group in IEEE 802
(first session will be at the November San Antonio meeting) to fully
document this and come out with a recommended practice. One of the
other drivers is the cloud computing world. There is talk about
partitioning the use of the LAS. I am against that as it increases the
collision probablity. Perhaps by usage domain.
In any case we will have to work out probe/discovery methods to discover
collisions for readdressing.
thanks for your input. I will see it gets included in the discussion.
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