Im not sure what sort of setup you have. But if you are connected from > modem > router > internet, and you try to change the mac, then your ip won't change.
If you were to take away your router, and connect the modem direct, then change the mac, this will surely change the ip. You have to take the router out of the equation. Maybe you have a router/modem all-in-one setup then i think this is no good to you. Anyway i tried to help lol
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