Are There Illegal MAC Addresses? Can They Cause Issues? or Are There Illegal MAC Addresses? What You

Illegal? Nah. Annoying? Absolutely.

Some routers straight-up reject MACs that don’t match their expected format. And if you spoof a MAC that’s already on the network, prepare for chaos.

Used Ettercap once to test spoofing—would not recommend unless you know what you’re doing.