linux-kernel - Re: Get physical MAC address

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Message-ID: <20080101181212.1e7b5ff0@deepthought>
Date:	Tue, 1 Jan 2008 18:12:12 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Bernd Petrovitsch <bernd@...mix.at>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Get physical MAC address

On Wed, 02 Jan 2008 00:07:28 +0100
Bernd Petrovitsch <bernd@...mix.at> wrote:

> On Mon, 2007-12-31 at 12:39 +0700, Theewara Vorakosit wrote:
> [...]
> > I get MAC address from ioctl. However, ifconfig can change this  MAC 
> > address. Can I get a real physical MAC address of the NIC?
> 
> - You can get the initial MAC address right after bootup before anyone
>   changes it.
> - Some (if not many if not all) of the drivers output it on
>   driver initialization time so you could read it from `dmesg` or
>   some /var/log/messages or .....
> There is no "get initial MAC address" ioctl (but it's not that
> complicated to implement it).
> 
> 	Bernd

There is already ethtool interface to get what you want (ETHTOOL_GPERMADDR)


-- 
Stephen Hemminger <stephen.hemminger@...tta.com>
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