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From: Lars Gaarden (larsgTRUSTIX.COM)
Date: Wed Feb 14 2001 - 02:53:55 CST

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    Alex Tibbles wrote:
    >
    > Until recently, MAC addresses were stored in EPROM's (i.e. only resettable
    > with UV light), or before that, PROM's - write once. Do they use EEPROMs
    > now?

    You don't change the MAC address stored in [EE]PROM on the card.

    The normal operation of most ethernet chipsets is that the driver
    reads the MAC address from this ROM and then use this value when
    generating ethernet frames. i.e., the card doesn't generate the
    ethernet frame, the driver does.

    So any driver that accepts a MAC address from a different source
    (say, from Linux ifconfig) can 'change' the MAC address. 

    --
LarsG