Some ISPs restrict Internet access to only one device by registering its MAC address. This can be referred to as 'MAC-based authentication' and might just require end-user to confirm the identity on the ISP Web Authentication Portal upon changing the CPE device. There are known set-ups, however, where customer will have to provide the MAC address of the connected PC or router to ISP over the phone or other way.
If that is actually the case and you know the MAC address that's registered with your ISP - it may be the address of your previous router device, or your PC's network adapter, or MAC is just printed out in the contract, it is then possible to substitute the factory MAC of your Keenetic with the necessary MAC address that your ISP would accept.
NOTE: Important! If your contract with the ISP includes the MAC address of another device, such as your computer, we recommend to inform ISP service of the WAN MAC address of the router. Keenetic WAN MAC is printed on the device label. That must be done prior to connecting the Ethernet line cable.
To instead spoof the MAC address of your Keenetic device with the one already registered, please follow the below step.
On the Wired page, under 'IP and DNS settings', please select one of the values in the MAC Address field:
'By Default' - the default factory setting, the WAN MAC address specified on the product label will be used;
'Get from your PC' - the WAN MAC address of you router will change to the MAC address of Network Interface Card of the computer which the web configuration menu is opened from;
'Manual' - manually specify the MAC address to be used as the WAN MAC address.
You can find out the Windows PC’s MAC address by following the instructions 'How do I view my network card settings (ISP's IP address, MAC address, and IP address) in Windows?'