How to configure a router with dynamic IP address in fiber optic cable

To set up a dynamic IP on your fiber optic router, configure the WAN/Internet connection type to DHCP so the router automatically obtains an IP from your ISP.Steps to Configure Dynamic IP

1. Connect to Your Router Use an Ethernet cable or Wi-Fi to connect your computer to the router. Open a web browser and enter the router's IP address (commonly 192.168.1.1 or 192.168.0.1) in the address bar. Enter your router's username and password, usually found on a label or in the manual (often admin/admin) .
2. Access WAN/Internet Settings Navigate to the WAN, Internet, or Network settings section of the router's web interface. Look for options labeled Internet Connection Type or WAN Connection Type .
3. Select Dynamic IP (DHCP) Choose Dynamic IP or DHCP as the connection type. This allows the router to automatically request an IP address from your ISP each time it connects to the internet .
4. Save and Reboot Save the settings and reboot the router. After restarting, the router will obtain a dynamic IP from your ISP automatically .

Optional: Dynamic DNS (DDNS) Setup

If you plan to host services like FTP, SSH, or remote desktop, your dynamic IP may change frequently. To maintain access, configure Dynamic DNS (DDNS):

• Sign up with a DDNS provider (e.g., No-IP, DynDNS) and register a hostname .
• In your router's web interface, locate the DDNS or Dynamic DNS section under Advanced settings.
• Enter your DDNS provider, account credentials, and hostname.
• Save the settings; the router will automatically update your DDNS provider whenever your WAN IP changes . For Google Fiber users, DDNS can be configured directly in the Network Box under Advanced > DNS, selecting your provider and entering credentials and hostname .

Notes and Tips

• Ensure your ISP allows a public WAN IP; some setups using CGNAT may prevent direct DDNS updates .
• Avoid using mobile or frequently moved devices as DDNS updaters, as this can cause incorrect IP updates .
• If your router does not support DDNS, you can run a DDNS client on a computer or NAS within your network . By following these steps, your fiber optic router will automatically manage a dynamic IP, and optional DDNS ensures consistent remote access even when the IP changes.