Changing MAC addresses of Quadruple port Ethernet cards

Hi,
I am writing this out of dire desperation and urgency  :-(
Could someone please help me to identify if there are any quadruple-port
Ethernet cards (Tulip or non-Tulip chip based) out there which enable
the individual port=92s MAC address to be changed to the user=92s desire?
The card is required to run on Linux 2.4.-4.

I am developing an interface to emulate a control system controller
which communicates using only Ethernet frames (embedded with proprietary
messaging protocol). The controllers -and the computers to which they
talk to- all have very specific and unique MAC addresses and any other
address will not do. The desired interface is to run on a Linux PC and
need to emulate 8 controllers each with a specific MAC address.
=A0
I would greatly appreciate any input on this.
=A0
Many thanks in advance.
Ramesh Kumar
=A0


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