To set up your router for fiber internet quickly, connect the router to your fiber modem, access the router's settings via a web browser, and input the provided ISP credentials. Make sure to update the firmware, configure Wi-Fi security, and customize your network name for optimal performance. However, if you're not accustomed to some of the jargon, like MAC cloning and PPPoE, you may encounter a few. There are endless ways to configure a fiber-optic network, but here are a few simple ways to add fiber to your existing network., Cat 6a) to fiber and back again.