linux-kernel - Re: Get physical MAC address

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Date:	Wed, 02 Jan 2008 10:31:25 +0100
From:	Bernd Petrovitsch <bernd@...mix.at>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	Theewara Vorakosit <thvo@...nc.cpe.ku.ac.th>,
	linux-kernel@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: Re: Get physical MAC address

On Die, 2008-01-01 at 22:58 -0600, Matt Domsch wrote:
> On Mon, Dec 31, 2007 at 12:39:11PM +0700, Theewara Vorakosit wrote:
> > Hello,
> > 
> > I get MAC address from ioctl. However, ifconfig can change this  MAC 
> > address. Can I get a real physical MAC address of the NIC?
> 
> yes.  It's ETHTOOL_GPERMADDR to the ethtool ioctl.
> 
>         case ETHTOOL_GPERMADDR:
>                 rc = ethtool_get_perm_addr(dev, useraddr);
>                 break;
> 
> When the driver is first loaded, before ifconfig can change the MAC
> address, the existing (permanent) MAC address is stored away, able to
> be retrieved via this ioctl.  Jon Wetzel, a Dell intern of a few
> summers ago, wrote the code and was able to have it included.

I stand corrected.
Last time I looked for such a thing it didn't exist.

	Bernd
-- 
Firmix Software GmbH                   http://www.firmix.at/
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