How to add a second router for wired expansion

Expanding Your Wired Network with an Additional Router

Adding a second router to your home or office network is an way to increase the number of wired connections available. This setup allows more devices to connect directly via Ethernet cables, enhancing speed and stability.

Understanding properly configure a second router is to avoid conflicts and ensure seamless network operation. This guide explains the necessary steps and options for adding a second router for wired expansion.

Reasons to Add a Second Router

One reason for introducing a second router is to provide additional Ethernet ports. Primary routers often have a number of LAN ports, which can restrict the number of wired devices.

Another reason is to extend network coverage or segregate traffic between different devices for improved performance or security. A second router can serve as a separate subnet or an extension of the existing network.

Basic Network Terminology to Know

Router: A device that directs data between different networks and manages traffic within a local network. It assigns IP addresses and acts as a gateway to the Internet.

Switch: A device that connects multiple devices within the same network, allowing communication between them. Switches do not manage IP addresses.

LAN (Local Area Network): The internal network connecting devices within a area, such as a home or office. LAN ports on routers are used for wired connections.

Preparation Steps Before Adding a Second Router

Before connecting the second router, ensure you have an Ethernet cable long enough to link your primary and secondary devices. Verify that both routers are powered off to prevent network issues during setup.

It is also important to gather the login credentials and configuration details for both routers. Knowing the IP address, username, and password is for accessing the router interfaces.

Two Methods for Adding a Second Router

The two primary methods for adding a second router are setting it up as an Access Point or configuring it as a Router in a separate subnet. Each method serves different purposes and has distinct configuration requirements.

Method 1: Using the Second Router as an Access Point

Configuring the second router as an Access Point extends the existing network, allowing devices connected to either router to communicate seamlessly. This method disables routing functions on the second device to avoid conflicts.

configure as an Access Point include disabling DHCP on the second router and assigning it a static IP address within the primary router’s subnet. Connect the primary router’s LAN port to the second router’s LAN port using an Ethernet cable.

Method 2: Configuring the Second Router as a Separate Network

Setting the second router as a separate network creates a distinct subnet, isolating devices connected to it from those on the primary router. This setup is useful for segmenting network traffic or managing guest devices.

To configure this, connect the primary router’s LAN port to the second router’s WAN port. Ensure DHCP is enabled on the second router, and assign its WAN interface an IP address from the primary router’s network.

Step-by-Step Guide for Access Point Setup

Start by logging into the second router’s web interface using its default IP address. Navigate to the LAN settings and assign a static IP address that matches the primary router’s subnet but is outside its DHCP range.

Next, disable the DHCP server on the second router to prevent IP address conflicts. Finally, connect an Ethernet cable from a LAN port on the primary router to a LAN port on the second router and power it on.

Step-by-Step Guide for Router Mode Setup

Access the second router’s settings and confirm that DHCP is enabled. Assign the WAN interface an IP address within the primary router’s network range, either manually or by DHCP.

Connect the primary router’s LAN port to the second router’s WAN port using an Ethernet cable. Devices connected to the second router will receive IP addresses from its DHCP server and be on a separate subnet.

IP Address and DHCP Configuration Comparison

Additional Configuration Tips

Ensure that the second router’s wireless network, if enabled, uses a different SSID or channel than the primary router to reduce interference. Use a strong password to secure your wired and wireless connections.

Update the firmware on both routers to the latest versions for performance and security patches. Document all configuration changes to troubleshooting or future adjustments.

Troubleshooting Issues

If devices connected to the second router cannot access the Internet, check the IP addressing and gateway settings. Verify that the Ethernet cable linking the two routers is functional and properly connected.

In Access Point mode, ensure DHCP is disabled on the second router; otherwise, IP conflicts will occur. In Router mode, confirm that the WAN port is connected and receiving an IP address from the primary router.

When to Consider Using a Network Switch Instead

If you only require additional Ethernet ports without advanced routing features, a network switch may be a simpler solution. Switches do not assign IP addresses and rely on the primary router to manage the network.

Using a switch avoids the complexity of configuring a second router but lacks the ability to segment or extend the network beyond simple port expansion. Consider your network needs carefully before selecting the device.

Last Updated : 20 June, 2025

Sandeep Bhandari

Sandeep Bhandari holds a Bachelor of Engineering in Computers from Thapar University (2006). He has 20 years of experience in the technology field. He has a keen interest in various technical fields, including database systems, computer networks, and programming. You can read more about him on his bio page.