netdev - Re: [RFC] ethernet: avoid pre-assigned OUI values in random_ether

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Message-ID: <20110513173213.491c74a1@nehalam>
Date:	Fri, 13 May 2011 17:32:13 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	rick.jones2@...com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] ethernet: avoid pre-assigned OUI values in
 random_ether_addr

On Fri, 13 May 2011 17:28:25 -0700
Rick Jones <rick.jones2@...com> wrote:

> On Fri, 2011-05-13 at 17:17 -0700, Stephen Hemminger wrote:
> > There are some addresses in the assigned vendor block that don't obey
> > the locally assigned convention. These should be avoided by random_ether_addr
> > assignment.
> 
> How "recent" are these violations?  Is there really a non-trivial chance
> of colliding?  Much more than two or more stations in the same broadcast
> domain randomly picking the same random MAC anyway?
> 
> At one level, avoiding using those OUIs seems to be a tacit approval of
> the violations.

These were assigned long ago in the early days of Ethernet.
It makes sense to me to avoid them as just good policy.


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