How to change MAC address on RPI-B?

[John W. Kitz]

Reiner,

I found a couple of examples in the FreeBSd documentation that may be useful
to you.

"The ether line will contain the MAC address of the specified interface.
Now, change the MAC address of the underlying wireless interface:

# ifconfig iwn0 ether 00:21:70:da:ae:37

Bring the wireless interface up, but do not set an IP address:

# ifconfig wlan0 create wlandev iwn0 ssid my_router up"

To retain this configuration across reboots, add the following entries to
/etc/rc.conf:

ifconfig_iwn0="ether 00:21:70:da:ae:37"

Source: https://www.freebsd.org/doc/handbook/network-aggregation.html

Are you sure the NIC you are using itself (i.e. aside from the driver) is
capable of supporting locally administered MAC addresses?

Jk.