That makes even less sense. Your modem maintains your public IP address as delivered to it by your ISP - which keeps a record of which MAC is given that IP. Your private IP's are handed out by your DHCP server, which will be either your modem our router - or in horrible cases both.Calm down lol ... im on Cable internet, i change the Router mac address in order to change my IP. i guess im just too lazy to walk up to the 3rd floor to reset my modem...because resetting the router does not change my IP.
You resetting your router MAC does absolutely nothing apart from confuse your modem - as your router is not working on your public IP - it's on an internal IP as handed out by your DHCP server - wether itself or the modem. If it was doing both duties - you wouldn't have a modem. Have you bridged anything or set subnets? Or have you just plugged everything in and hoped for the best?