>
> The hostid is not secret, because the last part of the ethernet
> address IS the last three bytes of the hostid, and the first byte
> of the hostid is the machine model (which is easy to guess).
> The ethernet address is broadcast during RARP, of course...
> 
	 
	  By default this is the case, but the hostid is relatively
easy to change in most cases.  The eeprom password could also be a
reasonable secret if you could get at it.