On learning about MAC addresses i came across U/L bit in the first octet. Further on i learned that MAC address could be spoofed.
If U/L bit switches according to MAC address modification , how could someone change the MAC address to a specific valid one ?
PC1 : MAC 04:11:11:11:11:11 PC2 : MAC 08:22:22:22:22:22
User tries to change PC2 MAC to 04:11:11:11:11:11 so U/L bit changes to 1 so MAC should be changing to 06:11:11:11:11:11
Is U/L bit toggled by system or user ? Is it mandatory to change U/L bit?