Power cycle both your fiber modem and router. Unplug the modem first, wait 30 seconds, then plug it back in and wait for all lights to stabilize. Next, unplug the router, wait 30 seconds, and plug it back in. This clears cached DNS entries, resets DHCP leases, and often resolves temporary connection glitches .
Ensure the fiber optic cable is securely connected to the modem and that the modem is connected to the router's WAN/Internet port, not a LAN port. Inspect cables for damage or fraying, as even minor issues can prevent internet access despite the lights being on .
Access your router's control panel (usually via a browser at an address like 192.168.0.1 or 192.168.1.1). Check the internet connection type (DHCP, PPPoE, or Static IP) and ensure the credentials provided by your ISP are correctly entered. If you previously used a static IP, confirm that all IP, gateway, and DNS settings match your ISP's instructions .
Connect a computer directly to the modem using an Ethernet cable. If the computer cannot access the internet, the problem may be with the ISP or modem configuration rather than the router .
Confirm whether there is an outage or service issue in your area by contacting your ISP or checking their status page. Sometimes, after an upgrade to fiber, the ISP may need to activate your service or update your account settings for the new connection .
If all steps fail, contact your ISP support. Fiber connections sometimes require specific authentication or MAC address registration, and your ISP can verify whether the modem and router are correctly configured for your service . By systematically following these steps, you can identify whether the issue is with your router, modem, or ISP, and restore internet connectivity.
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