Sharing the internet from Usb Modem(3g/4g) with the Rj45 port on arduino kit

I want to know that whether it is possible to share the internet connection from the USB modems(3g/4g) and mobile phone (using USB tethering )with the RJ45 connector on Arduino kit . I don't want to use the Wifi connection instead i want to route the data from USB to rj45 .Please help me out