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From: Chuck Swiger <cswiger@mac.com>
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Date: Mon, 24 Jan 2011 11:45:21 -0800
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To: Fred <fred@blakemfg.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Changing the MAC address on a LAN adapter
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On Jan 24, 2011, at 10:44 AM, Fred wrote:
> Ethernet MAC addresses are assigned by the manufacturer of the equipment.  Each unit gets a unique address which generally can't be changed and shouldn't be changed.  The manufacturer buys a block of addresses from the IEEE.

Yes, although folks can set the locally administered bit in the 6-byte MAC address instead of using globally administered addresses & vendor-assigned blocks from IEEE OUI...

Regards,
-- 
-Chuck