RE: mac duplication

[Peter Moody <peter () ucsc edu>]

> By their very definition, MAC addresses are globally unique.  So there's no
> 'standard' behavior.
> What a switch does when it sees a duplicated MAC is completely arbitrary...

This is not true.  It is indeed quite possible to change the MAC address
of a NIC, though it's not all that easy.  I've even heard of cards that
essentially search a local network for an unused MAC address (in a
particular range, I imagine) and grab one.

So yes, while MAC address are *supposed* to be globally unique, there is
no guarantee of this.

-Peter

-- 
Peter Moody                             <peter () ucsc edu>
Information Security Administrator      831/459.5409
Communications and Technology Services. UC, Santa Cruz.
http://security.ucsc.edu/pgp/peter.moody.pub
:wq

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