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. However, setting up a fiber optic connection to your router can seem daunting if you're unfamiliar with the process. With. Setting up a fiber internet connection requires understanding key hardware components and following a specific connection sequence to establish your home network. Run an Ethernet cable from the ONT to the WAN port on your.