On Wed, 16 Jan 2008 11:02:19 +0000, james.dutton@??? said:
> Fire up a linux box and connect it to the device via a crossover cable
> or hub. (not a switch, or if a switch, use a switch with a mirror port
> feature).
> Start wireshark or tcpdump on the linux box and just wait.
> The device should at some point output a packet. You can then find the
> devices MAC address.
If there aren't too many devices on the network then there is an easier
way: install arpwatch. That will report the MAC address of every new
device on the network.
Keith
-- 
Keith Edmunds
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