Subject: Re: MAC addresses
To: Manuel Bouyer <>
From: Frank van der Linden <>
List: tech-net
Date: 07/23/1998 12:51:37
On Thu, Jul 23, 1998 at 12:42:45PM +0200, Manuel Bouyer wrote:
> > In years past you could set the mac address using
> > the ifconfig command. Is it possible to change the
> > mac address of 3c905 cards?
> The driver for this board is sys/dev/ic/elink3.c and sys/dev/pci/if_ep_pci.c.
> Reading the code, the driver just read the MAC addr from the prom, but
> doesn't put it back in some register (which is needed for some
> other boards). So I'm not sure it is possible to use another MAC addr
> than the one set in the eeprom. Can someone with the 3com tech docs 
> add more infos to this ?

Yes, it is possible to change the address. You can write to the eeprom.
There are 2 addresses: the actual 3Com ethernet address, and the OEM
ethernet address. You want the last one. I don't have my docs with
me at the moment, but I can mail the description on how to do it.

- Frank