Unable to configure router after fiber optic installation

To configure your router with a fiber optic connection, ensure the ONT is properly connected, the router is compatible, and ISP settings are correctly applied.Step 1: Verify Your Hardware SetupOptical Network Terminal (ONT): Most fiber connections require an ONT provided by your ISP, which converts the fiber signal into Ethernet for your router .Router Compatibility: Ensure your router supports fiber connections, either via a standard WAN port or an SFP/SFP+ module if required .Cabling: Connect the fiber optic cable to the ONT, then use a high-quality Ethernet cable (Cat6a or higher) to link the ONT to your router's WAN port .Step 2: Power and Connection SequencePower on the ONT first and wait for the status lights to stabilize (usually 2–5 minutes) .Connect and power on your router, ensuring the WAN port is linked to the ONT.Avoid connecting multiple routers in series unless one is configured in bridge mode or DMZ to prevent IP conflicts .Step 3: Router ConfigurationAccess the router's admin panel via a browser (commonly 192.168.1.1 or 192.168.0.1) .Input your ISP-provided credentials if required (username, password, static IP, or PPPoE settings).If your ISP uses a static IP, ensure the router is set to Static IP mode and all details (IP address, gateway, DNS) match the ISP's information .Update the router firmware to the latest version to ensure compatibility with fiber connections .Step 4: Troubleshooting Common IssuesNo Internet Connection: Confirm the ONT is active and the fiber signal is stable. If a direct connection from a computer to the ONT fails, the issue may be on the ISP's end .IP Conflicts: If the ISP's gateway is not in bridge mode, your router may need to be placed in DMZ or use a different subnet to avoid conflicts .MAC Address Registration: Some ISPs require the ONT to recognize the router's MAC address. Clone the MAC address of a previously working device if necessary .Reboot Sequence: Power cycle the ONT, router, and connected devices in order: ONT → Router → Devices.Step 5: Verify ConnectionCheck the router's WAN status for a valid external IP.Test internet connectivity on a connected device.Configure Wi-Fi security and network name for optimal performance . If these steps do not resolve the issue, contact your ISP to confirm that the fiber service is fully activated and that the ONT is correctly provisioned. Being the first fiber subscriber in a building may require ISP-side configuration adjustments .