On Mon, 30 Aug 2010 10:07:06 +0200
"Jean-Francois" <[email protected]> wrote:
> is responsible for it, how is it processed and is it possible to change the 
> physical address in the packets sent for an address of our choice ?

If you want to change the MAC address for one of your network
interfaces, then you can use
ifconfig em0 lladdr 11:22:33:44:55:66

If you want a different MAC for different *destination* addresses
(why???), then you will have to write code.

regards,
Robert

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