strange mac address issue

[Erez D]

i have an embbeded linux board. connected a usb2eth (rj45), and through
that to the lan.

suprisingly, another usb2eth on another copy of the embedded board, has the
same mac address, and so i get conflicts on the network.

swapping different modules of usb2eth on the same board gives same mac
address.
I'll call this mac address 'Mac Address A'

so i wanted to see if linux is causing this issue. i tried to connect these
usb2eth on a win7 machine.

on win7, all of the usb2eth get the same mac address. however this is a
differnet mac address then the previous. i'll call it 'Mac Address B'

on another usb port on the same win7, i get 'Mac Address C'. again it does
not matter which usb2eth i use


All the usb2eth are idVendor=0fe6, idProduct=9700 (dm9601)
(although physically different)

any idea ?
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