Check out "Apple LAN Utility"

the read me is at 
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/Misc/Apple_LAN_Utility_1.0b4.txt

Never tried it, and I don't know if patching with this will only 
apply from within the MacOS.

Let us know if it helps.

-Bronson


>My basic question is, can I change the MAC address in the internal
>ethernet interface of my Centris 650 (sn0)?
>
>The issue I have is that I want to run DHCP for my cable modem
>with InsightBB (which uses ATT's cable modem infrastructure) and
>they tie the cable modem / DHCP to a single registered client
>MAC. They fully allow you to re register clients, but I would
>really like to be able to be able to just switch back and forth
>without jumping through hoops.
>
>I read several older threads which indicate ifconfig in solaris
>and maybe linux allows the "ether aa:bb:cc:dd:ee:ff" as a mechanism
>to accomplish this.
>
>I also read an old thread in the tech-net:
>http://mail-index.netbsd.org/tech-net/2001/01/16/0002.html
>which indicates (I think) that at some point "they" thought
>it was possible (though not with an ifconfig interface?)???
>
>At this point a definitive answer would be helpful...
>
>Thanks,
>gene
>
>yancm@sdf.lonestar.org
>SDF Public Access UNIX System - http://sdf.lonestar.org


-- 
   Bronson Trevor
  btrevor@acm.org