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From: John Baldwin <jhb@freebsd.org>
To: freebsd-hackers@freebsd.org
Subject: Re: Common storage of original MAC address
Date: Wed, 20 Aug 2014 11:43:04 -0400
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 (bigwig.baldwin.cx); Wed, 20 Aug 2014 12:00:47 -0400 (EDT)
Cc: "Pokala, Ravi" <rpokala@panasas.com>, Ryan Stone <rysto32@gmail.com>,
 Brooks Davis <brooks@freebsd.org>
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On Tuesday, August 19, 2014 1:19:02 am Pokala, Ravi wrote:
> Or how about an ioctl to get the original MAC (rather than a sysctl). Then
> the "restore to default" code would be a two-step process - get the
> original MAC with the new ioctl (say "SIOCGHWLLADDR" for "Get Hardware
> LLADDR"?), and then set the working MAC to that value w/ the existing
> ioctl (SIOCSIFLLADDR).
> 
> I actually like this idea more than the sysctl, because it could be done
> in one place (probably in net/if.c, next to if_setlladdr() (which is what
> implements the guts of SIOCSIFLLADDR)).
> 
> Does that sound like a plan?

I prefer this approach as it preserves the original lladdr as an lladdr rather 
than a string.  You could add something to ifconfig to display the hardware
address (perhaps have ifconfig display it by default if it differs from the 
currently configured MAC)

-- 
John Baldwin