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How ? Denying DHCP with MAC Filtering for Private MAC Address

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Currently my client reportly found DHCP issues e.g. IP Conflict and DHCP Range full rapidly.

The root cause I found is now IOS14/Android10 offer a feature called 'Private MAC Address'


with MAC Randomization mechanism especially on IOS14 which will re-random its MAC address every 24 hours.

However the random MAC addresses can easily be identified as their first octet ended with '2 ,6 , a or E'

For example 02:5C:10:00:FF:AD or 0E:1B:77:FF:AD:AA


So, How can I create a MAC filter rule to prevent the devices with this feature to join network and get DHCP ?

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