Overview

This guide explains how to add a secondary IP address to a LAN interface on a Robustel router running RobustOS. This configuration is primarily used to enable communication with terminal devices on a different IP subnet without altering the router's default LAN IP address. By adding multiple IPs, the router can effectively have a presence on several logical networks through a single physical LAN interface, simplifying network integration.

What You'll Need

Hardware List:

• 1 x Robustel Router (e.g., R1520, R2011, etc.)
• 1 x PC or Laptop
• 1 x Ethernet Cable
• 1 x Power Supply for the router

Software/Firmware:

• RobustOS Firmware (This guide is based on RobustOS v.5.3.2)

Prerequisites:

• Ensure your PC is connected to the gateway's LAN port via an Ethernet cable.
• Log in to the Router's web interface. The default IP address is typically http://192.168.0.1.

Step-by-Step Configuration Guide

The entire configuration is done through the router's web interface.

Add a New IP Address

1. Navigate to Interface > LAN from the main menu.
2. Click on the Multiple IP tab.
3. Under the Multiple IP Settings section, click the + (Add) icon to open the configuration window for a new IP address.
4. In the pop-up window, configure the following parameters:

• Interface: Select the LAN interface you want to add the new IP to from the dropdown menu. Typically, this will be lan0. (Note: When lan0 is the only interface, it is not selectable and will be used by default.)
• IPv4 Address: Enter the new IP address you wish to add (e.g., 192.168.1.254).
• Netmask: Enter the corresponding subnet mask for the new IP address (e.g., 255.255.255.0).

5. Click Submit to confirm the entry.
6. Click the Save & Apply button at the top right of the main page to make the changes take effect.
   

Verification & Testing

To confirm the configuration was successful, you can perform a simple ping test.

1. Configure your PC's IP Address: Manually set the IP address of your PC to be in the same subnet as the new IP you just added to the router. For example, if you added 192.168.1.254 to the router, set your PC's IP to 192.168.1.253 and its subnet mask to 255.255.255.0.
2. Connect PC to Router: Ensure your PC is connected to a LAN port of the Robustel router with an Ethernet cable.
3. Perform a Ping Test: Open a Command Prompt (on Windows) or Terminal (on macOS/Linux) on your PC and type the command ping 192.168.1.254 (using the new IP you added).
4. Check the Result: If you receive replies from the router, the secondary IP address has been added successfully, and the router is now accessible on that IP.
   

Troubleshooting / FAQ

Q: I have added the new IP address, but I cannot ping it from my PC.
A:

• Check PC Configuration: Double-check that your PC's IP address and subnet mask are correctly set and are in the same subnet as the new IP you added to the router.
• Verify Physical Connection: Ensure the Ethernet cable is securely connected between your PC and the router's LAN port.
• Confirm Configuration: Go back to the Interface -> LAN -> Multiple IP page on the router's web interface and verify that the IP address you added is correct and that you clicked Save & Apply.
• Firewall Issues: Temporarily disable any firewall software on your PC to ensure it is not blocking the ping requests.

Revision History