netdev - Re: [PATCH] pch_gbe: Use a randomly generated MAC instead of failing probe

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Message-ID: <20120116164424.GA19621@sirena.org.uk>
Date:	Mon, 16 Jan 2012 16:44:24 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	Darren Hart <dvhart@...ux.intel.com>,
	Alan Cox <alan@...ux.intel.com>,
	Tomoya MORINAGA <tomoya.rohm@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, jeffrey.t.kirsher@...el.com,
	paul.gortmaker@...driver.com, jdmason@...zu.us,
	netdev@...r.kernel.org
Subject: Re: [PATCH] pch_gbe: Use a randomly generated MAC instead of
 failing probe

On Mon, Jan 16, 2012 at 08:35:09AM -0800, Arjan van de Ven wrote:
> On 1/16/2012 8:20 AM, David Laight wrote:

> > Since multiple interfaces on a single system are unlikely
> > to be connected to the same LAN segment, it doesn't really
> > matter if they use same MAC address.

> I think you missed the point. All embedded devices have the same fs, so
> if you have 2 boxes of the same model/brand on the same network, they'd
> have the same MAC. That's generally frowned upon by network
> administrators ;-)

This is generally handled by putting the MAC into a board-specific bit
of flash that isn't part the main firmware (for example, the bootloader
configuration) - for a lot of applications random generation doesn't
help that much as entropy is hard to come by.
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