Connecting Two Wi-Fi Routers into One Network Using a Cable: A Complete Guide

Connecting two routers into a single network via a cable connection is the optimal solution for expanding Wi-Fi coverage without sacrificing speed. Unlike wireless bridges (WDS), connection via Ethernet guarantees stability and minimal latency, which is critical for online gaming, 4K video streaming, or remote office work.

This guide is suitable for both home networks, where a second router is needed to boost the signal on the second floor or in a remote room, and small offices that need to segment traffic. We'll cover two basic setups: cascading (LAN-to-LAN) And client mode (LAN-to-WAN), as well as the nuances of setting up IP addresses, DHCP servers and parameters Wi-Fi for uninterrupted operation.

Important: If you have routers from different manufacturers (for example, TP-Link And ASUS), the procedure will remain the same, but the names of the menu items may differ. For models with firmware DD-WRT or OpenWRT Additional settings will be required - we will place them in a separate section.

1. When is it necessary to connect routers using a cable?

Before you start setting up, decide if you really need it. physical connection two devices. A cable connection is relevant in the following cases:

• 📶 Weak Wi-Fi signal in individual rooms, especially if the walls are made of concrete or reinforced drywall. The cable minimizes data packet loss.
• 🎮 Low ping in games. Wireless bridges (WDS or Repeater) add a delay of up to 30–50 ms, which is critical for CS:GO, Valorant or Fortnite.
• 🏢 Network segmentationFor example, for guest Wi-Fi on a second router with a separate SSID and speed limits.
• 🖥️ Connecting wired devices (IP cameras, NAS, printers) in a remote area without laying a new cable from the main router.

If your goal is simply to expand your coverage area Wi-Fi Without wires, consider alternatives:

• 🔄 Repeater mode (Repeater) - suitable for small houses, but reduces speed by 30-50%.
• 📡 Mesh systems (For example, TP-Link Deco or ASUS ZenWiFi) - more expensive, but easier to set up.

2. Choosing a connection scheme: LAN-to-LAN vs. LAN-to-WAN

There are two main ways to connect routers via cable. They differ in their distribution. IP addresses and work DHCP servers:

LAN-to-LAN — the optimal choice for most users. In this mode, the second router functions as switch with an access point Wi-Fi, and all devices receive IP from the main router. LAN-to-WAN is needed if it is necessary to isolate a part of the network (for example, for IoT devices or guests).

⚠️ Attention: If your provider ties your internet access to MAC address main router diagram LAN-to-WAN You can't use it - the internet won't work. In this case, choose LAN-to-LAN or set up cloning MAC on the second device.

3. Preparation of equipment and cable

To connect two routers via cable, you will need:

• 🔌 Ethernet cable categories Cat 5e or higher. Length - up to 100 meters (maximum for the standard 100BASE-TX). For speeds above 1 Gbps, use Cat 6.
• 📡 Two routers. Basic (main) must have free LAN port, secondary (subordinate) — port WAN (for the diagram LAN-to-WAN) or LAN (For LAN-to-LAN).
• 🔧 Computer or smartphone to access the web interface of routers.

Which cable should I use? To connect LAN-to-LAN a regular one will do direct cable (both ends are crimped to standard T568B). For LAN-to-WAN a straight cable is also needed - crossover (with cross crimping) is only required to connect two devices without Auto-MDI/MDIX (in modern routers this function is available by default).

A critical detail: if you have a router with a port LAN/WAN (For example, Keenetic or MikroTik), check its current mode in the settings before connecting. An incorrect selection will result in a loss of connection.

4. Setting up a LAN-to-LAN scheme (bridge mode)

This scheme is suitable for expanding the network without segmentation. All devices will be on the same subnet (for example, 192.168.1.0/24).

Step 1: Connecting the Cable

Connect LAN port main router with LAN port secondary. Do not use the WAN port on the second device!

Step 2: Configure the Secondary Router's IP Address

1. Connect to the web interface of the secondary router (usually at 192.168.0.1 or 192.168.1.1 - see the sticker on the device).

2. Go to the network settings section (for example, Network → LAN V TP-Link or Local area network V Keenetic).

3. Change IP address router so that it is included in the main subnet, but does not conflict with its DHCP poolFor example, if the main router has IP 192.168.1.1 and distributes addresses with 192.168.1.100 to 192.168.1.199, set the secondary address 192.168.1.2.

Step 3: Disable the DHCP server

In the settings DHCP (chapter DHCP → Settings or similar) turn off the serverThis will prevent conflicts. IP addresses.

Step 4: Setting up Wi-Fi

To have devices automatically switch between access points:

• 🔄 Ask same SSID (network name) on both routers.
• 🔐 Use the same password and encryption type (WPA2-PSK or WPA3).
• 📶 Select different channels (e.g. 1 and 6 for 2.4GHz band) to avoid interference.

Step 5: Saving the settings

Apply the changes and reboot both routers. Afterwards, test the connection by connecting a device to Wi-Fi or LAN-port of the secondary router.

⚠️ Attention: If the internet doesn't work after connecting, check if the main router is blocking traffic between LAN ports (function AP Isolation or Client Isolation). Disable it in your wireless network settings.

5. Setting up a LAN-to-WAN scheme (cascade with segmentation)

This scheme creates two separate subnets. For example, the main router distributes 192.168.1.x, and the secondary one is 192.168.2.xSuitable for offices or if you need to restrict access between segments.

Step 1: Connecting the Cable

Connect LAN port main router with WAN port secondary. This is the key difference from the scheme LAN-to-LAN.

Step 2: Setting up a WAN connection

On the secondary router:

1. Go to the section WAN or Internet.
2. Select connection type Dynamic IP (if the main router distributes addresses DHCP) or Static IP (if you need to set a fixed address).
3. For Static IP please specify:
   • IP address: 192.168.1.2 (must be outside DHCP pool main router).
   • Subnet mask: 255.255.255.0.
   • Main gateway: 192.168.1.1 (IP of the main router).
   • DNS: 192.168.1.1 or public DNS (8.8.8.8, 1.1.1.1).

Step 3: Configure LAN and DHCP

Ask Local network IP address secondary router from another subnet, for example 192.168.2.1. Turn on DHCP server with a range 192.168.2.100–192.168.2.199.

Step 4: Setting up Wi-Fi

You can use it here great network name (SSID) from the main router to visually separate the segments. For example:

• 🏠 Main router: MyHomeWiFi
• 🏢 Secondary router: MyHomeWiFi_Guest

Step 5: Check Routing

By default, devices from different subnets will not "see" each other. To allow data exchange (for example, to access a printer or NAS), on the main router add static route:

Target network: 192.168.2.0
Subnet mask: 255.255.255.0
Gateway: 192.168.1.2 (WAN IP of the secondary router)

ping 192.168.2.1

⚠️ Attention: In the diagram LAN-to-WAN The internet speed on the secondary router will be limited by its bandwidth WAN portIf you have a gigabit plan and the port WAN at 100 Mbps, the maximum speed will be ~95 Mbps.

6. Configuration features for routers with alternative firmware

If your router is running on DD-WRT, OpenWRT or Tomato, the procedure will differ. Let's look at the setup using an example. DD-WRT:

For LAN-to-LAN scheme:

1. Connect to the web interface (192.168.1.1).
2. Go to Setup → Basic Setup.
3. In the section Network Setup:
   • Install Local IP Address (For example, 192.168.1.2).
   • Turn it off DHCP Server (DHCP Type: Disable).

For LAN-to-WAN scheme:

1. IN Setup → Basic Setup:
   • Install WAN Connection Type: Automatic Configuration – DHCP.
   • Ask Local IP Address from another subnet (for example, 192.168.2.1).

For OpenWRT editing of configuration files will be required (/etc/config/network And /etc/config/dhcp). Example of setting for LAN-to-LAN:

config interface 'lan'
option type 'bridge'
option ifname 'eth0.1'
option proto 'static'
option ipaddr '192.168.1.2'
option netmask '255.255.255.0'
option gateway '192.168.1.1'
option dns '192.168.1.1'

7. Problem diagnosis and solutions

If after setup the devices do not connect to the internet or do not see each other, check the following:

Diagnostic tools:

• 🔍 Ping: checking the connection between devices.

  ping 192.168.1.1

• 🌐 Traceroute: packet routing determination.

  tracert ya.ru

• 📊 Speedtest: internet speed test on both routers.

8. Frequently Asked Questions (FAQ)