IP adresses are not unique enough.

[Ben Hutchings]

gogo at bluedynamics.com (Georg Gogo. BERNHARD) writes:
<snip>
> The MAC adresses are unique, as I understood.
<snip>

I have some anecdotal evidence of cases where a manufacturer assigned
duplicate MAC addresses.  Someone found me a documented case, too:
<http://puck.nether.net/lists/cisco-nsp/2731.html>.

-- 
Any opinions expressed are my own and not necessarily those of Roundpoint.