MacOS X 10.1.4 MAC Address Spoofing

["Juan M. Courcoul" <courcoul () campus qro itesm mx>]

I was recently discussing how MAC addresses can be spoofed in Ethernet 
adapters and was told that "you can't spoof MAC addresses on MacOS X, 
especially with version 10.1.4". I've tried playing around with various 
ifconfig parameters with no success, but I may be overlooking something 
and spoofing might be doable. Then, also, there might be exploit code 
floating around to do this.

Is MacOS X spoof-proof out of the box ? Is it spoofable with additional 
software ? We may be setting up a student lab with the new e-Macs and 
I'd like to ascertain whether you can trust a Mac MAC address for 
authentication purposes or not.

Thanks,

J. Courcoul