I was taught that the MAC Address is physical and cannot be changed. But, it seems like MAC Address can be changed for different uses. For example, b0 in the first octet is 0 for unicast purpose and 1 for multi/broadcast purpose. MAC Address can be changed according to needs right?
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MAC address in the source field of ethernet frame cant be changed, and what you talk about returns to Dr.Stephan Deering story back to 1990s.
A MAC address is unique around the world but in some situations you could require change it, for example you can change the MAC address associated to the Ethernet interface, for example:
Hope it is useful