linux-kernel - Re: rtl8187: Invalid hwaddr! Using randomly generated MAC address

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Message-ID: <20070817172522.GD6090@tuxdriver.com>
Date:	Fri, 17 Aug 2007 13:25:22 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	flamingice@...rmilk.net
Subject: Re: rtl8187: Invalid hwaddr! Using randomly generated MAC address

Probably want to copy linux-wireless@...r.kernel.org on
wireless-related posts.  Adding Michael Wu to the CC: as well...

John

On Fri, Aug 17, 2007 at 04:59:33PM +0100, Alan Jenkins wrote:
> I've just acquired this buggy piece of hardware otherwise known as a
> NetGear WG111v2.  I googled and eventually found an explanation in the
> form of source code here:
> 
> <http://www.gelato.unsw.edu.au/lxr/source/include/linux/etherdevice.h#L93>.
> 
> 
> It seems linux rejects the hardware MAC address because it is either all
> zero or a multicast address (ie the first byte has 0x01 set.
> 
> On the side of this buggy piece of hardware is written:
> 
> MAC 001B2F7604E6
> 
> which AFAICS is valid; it's definitely not all zeros and the first byte
> has no bits set at all.
> 
> 
> Q.  Udev can't access the invalid mac address.  Does that mean there is
> no persistent identifier for the device?  I know I could identify a
> device as a NetGear WG111v2, but I do have two of them.  It would be
> nice if I could fix them by adding udev rules to identify individual
> devices, and set their MAC address to what it's "supposed" to be.
> 
> /me scrabbles around for a Windows installation to find out whether the
> MAC address is somehow set correctly on the Other OS.
> -
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-- 
John W. Linville
linville@...driver.com
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