Hello 
sorry for my english
Please help me for a problem !
I change de Ethernet 1 card in the PC and now my connection to cable modem don’t work anymore 
(is another MAC for this ethernet card)
How it’s possible to change MAC address for a Ethernet 1 connected to my cable modem for working like first network card (Clone the MAC address from first ethernet card) ? ( in Windows i change MAC address from driver properties, but in MIKROTIK how is possible ?)
Please help !
nobody ?
The MAC address is hard coded into the LAN card. Sometimes the card drivers will include a utility to change MAC address but not always.
OK … i know this but how is possible to change from MIKROTIK OS ? In windows is possible from driver properties … any suggestion ?
Why does the cable company care that you change your mac address?
That’s how they control who can access, by provisioning the PC MAC.
We call this process “Clone a MAC” and that’s not available in MT.