MAC address not shown?

[David Piniella <dpiniell@newssun.med.miami.edu>]

My sarge machine has a weird problem: it's set to DHCP and the DHCP 
server has the machine's MAC address bound to a particular 10.x.x.x IP; 
lately another computer has been getting IP conflicts with the same IP, 
even though it has a different MAC address. Doing an nbtstat -a on the 
Debian sarge machine tells me that that MAC on it is 00-00-00-00-00-00 
(a languard scan says the same thing...)

why is the debian's MAC address not shown or unscannable? could this be 
causing the problem? also note that the machine is probably reporting 
it's mac to the dhcp server (i'm guessing this because it's getting the 
IP that the MAC address is tied to).

Any ideas or suggestions would be most welcome,

--
David Piniella
University of Miami