Some ISP may register the MAC address of your computer when you dialing up to Internet for the first time via modem. If you add a router into your network to share your Internet connection, the ISP will not accept it. So you need to do MAC address clone on the router.
Note: Connect the computer which used to dial up to the router, then configure the router as below:
Open the web browser and in the address bar type in: http://192.168.1.1 or http://192.168.0.1 or http://tplinklogin.net.Then press Enter.
The LAN IP changes by model. Please find it on the bottom label of the product.
Type the username and password in the login page. They are both admin by default.
Click Network->MAC Clone on the left side.
ClickClone MAC Addressto clone your PC’s MAC address toWAN MAC Address of the router.
Click Save to save the settings.