linux-kernel - Re: Get physical MAC address

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Date:	Tue, 1 Jan 2008 22:58:00 -0600
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Theewara Vorakosit <thvo@...nc.cpe.ku.ac.th>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Get physical MAC address

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.

Thanks,
Matt

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
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