Configuring port forwarding on your Synology RT1900ac router is essential for enabling external devices to access services hosted on your local network. As of 2026, the process remains straightforward, but it's important to follow each step carefully to ensure security and functionality.

Prerequisites

  • Admin access to your Synology RT1900ac router
  • Knowing the local IP address of the device hosting the service
  • The port number(s) you wish to forward
  • A stable internet connection

Accessing the Router

Open a web browser and enter the router's IP address, typically 192.168.1.1. Log in with your administrator credentials. If you haven't changed the default login, use the default username and password provided in the router manual.

Once logged in, go to the Network Center. From there, select Port Forwarding or a similar option, depending on your firmware version. In the latest firmware, this is typically under Advanced Settings.

Creating a New Port Forwarding Rule

Click on Add or Create New Rule. Fill in the following details:

  • Service Name: Enter a descriptive name (e.g., "Web Server")
  • Port Range: Enter the external port number (e.g., 8080)
  • Local IP: Enter the IP address of the device hosting the service (e.g., 192.168.1.100)
  • Local Port: Enter the internal port number (often the same as external)
  • Protocol: Choose TCP, UDP, or both, depending on your service requirements

Saving and Testing the Configuration

After entering all required information, save the rule. It may take a few moments for the settings to apply. To test, from an external network, try accessing the service using your public IP address and the forwarded port. You can find your public IP by searching "what is my IP" on Google.

Additional Tips

  • Ensure your device's firewall allows incoming connections on the forwarded port.
  • Use a static IP address for your internal device to prevent IP changes that could disrupt port forwarding.
  • Regularly update your router firmware to maintain security and compatibility.
  • Consider setting up Dynamic DNS if your public IP address changes frequently.

Conclusion

Configuring port forwarding on your Synology RT1900ac router in 2026 is a vital step for hosting services or accessing devices remotely. By following these steps, you can ensure a secure and reliable connection to your network resources.