How to connect two routers together via cable: boost Wi-Fi without losing speed

A weak Wi-Fi signal in distant rooms or across multiple floors is a common problem faced by apartment and homeowners. Purchasing a powerful router isn't always the solution: walls, furniture, and distance can reduce connection quality. The optimal solution is connect the second router to the main one via an Ethernet cable, creating a single network with an expanded coverage area.

Unlike wireless bridges (WDS) or repeaters, a cable connection guarantees maximum stability and speed, as it eliminates the delays and packet loss inherent in Wi-Fi. This method is suitable for homes with pre-wired connections or the ability to run cables between rooms. In this article, we'll cover step-by-step instructions, selecting operating modes (bridge, router, access point), and common mistakes that can hinder results.

When do you need to connect two routers via cable?

Using a second router is justified in several scenarios:

• 📶 Large area of ​​the house (from 100 m²) or several floors, where one router does not cover all the rooms.
• 🖥️ Need to connect stationary devices (PC, Smart TV, game consoles) via cable in another room.
• 📡 Poor conditions for Wi-Fi: thick walls, metal structures, interference from neighboring networks.
• 🔄 The desire to divide the network into zones (for example, guest Wi-Fi on the first floor and the main network on the second).

The advantage of a cable connection over wireless alternatives:

If your home is already equipped with twisted pair cable (for example, for IP telephony or an old local area network), you can use the existing cables. Otherwise, you'll have to install new ones—this is the only drawback of this method.

What equipment will you need?

To organize the connection you will need:

• 🔌 Main router (already connected to the internet). Any model with a port will do. LAN or WAN/LAN.
• 🔄 Second router (will work as an access point or bridge). Preferably the same brand as the main one—this will simplify setup.
• 📡 Ethernet cable (twisted pair category Cat 5e or higher). The length depends on the distance between routers (maximum 100 meters without amplifiers).
• 🔧 Crimper and RJ-45 connectors (if the cable needs to be crimped manually).

Recommended router models for cable connection:

• 🏆 ASUS RT-AX88U — supports bridge and access point modes, flexible settings.
• 💰 TP-Link Archer C6 - a budget option with a reliable LAN port.
• 🛡️ Keenetic Ultra — optimized for operation in conjunction with other routers.
• 📶 MikroTik hAP ac² — for advanced users (requires manual configuration).

⚠️ Attention: If the second router is older than 5 years, check if it supports the modes AP Mode (access point) or Bridge Mode (bridge). Obsolete models (eg D-Link DIR-300 or TP-Link TL-WR740N) may not be suitable.

Connection diagrams: which option to choose?

There are three main cable connection schemes for routers. The choice depends on your goals:

1. Access Point Mode

The second router works as continuation of the main network, sharing the same Wi-Fi (SSID and password). All devices will be on the same subnet, which is convenient for file sharing or video streaming.

Pros: Single network, no double authentication, high speed.
Cons: requires support of the regime AP Mode on the second router.

2. Bridge Mode

The second router connects to the main router as a client but does not create a separate network. It is rarely used, as it lacks the functionality of access point mode.

3. Cascade connection (LAN-to-LAN or LAN-to-WAN)

The routers operate as two separate networks (different SSIDs), but the second one receives internet from the first. This is suitable for separating traffic (for example, for a guest network).

Advice: Optimal for most household tasks AP ModeIf your router doesn't support it, use a cascade connection. LAN-to-LAN.

What is the difference between LAN-to-LAN and LAN-to-WAN?

At LAN-to-LAN Both routers are on the same subnet (for example, 192.168.1.x), which allows the devices to "see" each other. LAN-to-WAN The second router creates a separate subnet (for example, 192.168.2.x), which complicates the exchange of data between devices, but adds isolation (useful for guest networks).

Step-by-step instructions: connecting routers via cable

Let's consider a universal method for setting up a second router in mode access points (AP Mode). The instructions are suitable for most modern models (ASUS, TP-Link, Keenetic, Zyxel).

Step 1: Physical connection

1. Turn off the power of both routers.
2. Connect LAN port of the main router With LAN port of the second router With an Ethernet cable. Do not use the WAN port on the second router!
3. Turn on both devices.

Step 2: Setting up the main router

On the main router you need to:

1. Reserve an IP address for the second router (so it always receives the same address). To do this:
• Go to the web interface of the main router (usually at 192.168.1.1 or 192.168.0.1).
• Find the section DHCP → Address Reservation (or LAN → DHCP Server).
• Add a new rule by specifying the MAC address of the second router (located on the sticker on its body) and the desired IP (for example, 192.168.1.2).

Turn it off DHCP server on the second router (we will do thisLater).

Step 3: Setting up the second router (AP Mode)

Connect to the second router via cable or Wi-Fi (if it is not already configured):

1. Go to its web interface (the address is indicated on the sticker, for example, 192.168.0.1).
2. Find the section Opening hours (or Operation Mode) and select Access Point (AP Mode).
3. In the settings LAN Change the IP address of the second router so that it is in the subnet of the main router, but does not conflict with it. For example, if the main router has an IP 192.168.1.1, ask the second one 192.168.1.2.
4. Turn it off DHCP server on the second router (section DHCP → DHCP Settings).
5. In the settings Wi-Fi indicate the same SSID (network name) and password, as on the main router. For ASUS And Keenetic can be turned on Roaming Assist for smooth switching between points.

DHCP is disabled on the second router|The IP addresses of the routers are on the same subnet|The SSID and Wi-Fi password are the same|The cable is connected to the LAN ports of both devices|The MAC address of the second router is reserved on the main one-->

Step 4: Testing the connection

After saving the settings:

1. Reboot both routers.
2. Connect to Wi-Fi from any device and check your speed on the website. speedtest.net.
3. Walk around your house with your phone to ensure smooth roaming between points.

⚠️ Attention: If the devices don't receive an IP address after setup, check if the router subnets are conflicting. For example, if the main router has a subnet 192.168.1.x, and the second one is 192.168.0.x, the connection will not work.

Common mistakes and how to avoid them

Even with proper connections, problems can arise. Let's look at the most common ones:

Problem	Cause	Solution
No internet access	The cable is connected to the WAN port of the second router.	Reconnect the cable in LAN port
The devices don't see each other	Different subnets (e.g. 192.168.1.x and 192.168.0.x)	Configure IP addresses in the same subnet
Wi-Fi works, but the speed is slow	The cable is damaged or of a lower category Cat 5e	Replace the cable with Cat 6 or check the crimping
Double authentication (requests password twice)	Different SSIDs on routers	Set the same SSID and password

Another common mistake is DHCP enabled on the second routerThis leads to IP address conflicts and network instability. Always disable DHCP on the secondary access point!

How to lay a cable between routers?

If your home doesn't have pre-wired wiring, you'll have to install it yourself. Here are some tips:

• 📏 Maximum cable length - 100 meters for Cat 5e/6For longer distances you will need signal amplifiers or fiber optic.
• 🚫 Avoid laying cables near electrical wiring or household appliances - this causes interference.
• 🔌 Use cable channels or baseboards with a niche for hidden installation.
• 🔧 To crimp connectors, use crimper and follow the diagram T568B (the most common standard).

If cable routing is not possible, consider alternatives:

• 🔌 Powerline adapters — transmit the Internet via electrical wiring (speed up to 1 Gbit/s, but depends on the quality of the wiring).
• 📡 MoCA adapters — use a coaxial cable (from an antenna or cable TV).

⚠️ Attention: If you are running cables in walls, use flame retardant cable (marking LSZH or CM). Ordinary twisted pair cable can release toxic substances when heated.

Additional settings for network optimization

After a successful connection, you can improve network performance:

• 📶 Setting up roaming: If both routers support 802.11k/v/r (For example, ASUS AiMesh or TP-Link OneMesh), enable these protocols for seamless switching between points.
• 🔒 Guest Wi-Fi: On the second router, you can create a separate network for guests with limited access to local devices.
• 📊 Traffic prioritization (QoS): On your main router, set priorities for video, games, or calls.
• 🔄 Automatic firmware update: Enable this option on both routers to protect against vulnerabilities.

For models Keenetic And MikroTik Advanced features available:

• 📈 Load balancing — distribution of devices between two access points.
• 🛡️ MAC address filtering — restricting access for unknown devices.

FAQ: Frequently asked questions about connecting two routers

Is it possible to connect routers via the WAN port of a second device?

Yes, but it will create two separate subnets (NAT), which can cause problems accessing network devices (such as printers or IP cameras). This option is only suitable for a guest network.

How to find out the MAC address of the second router?

The MAC address is located on a sticker on the device (usually next to the serial number). It can also be found in the router's web interface in the "Settings" section. Status or Local area network.

Why did the Wi-Fi speed drop after connecting?

Possible reasons:

• Low category cable (eg Cat 5 instead of Cat 5e).
• On DHCP on the second router (turn it off).
• Different Wi-Fi standards (for example, the main router operates on 802.11ac, and the second one is on 802.11n).

Check your Wi-Fi channel settings - they should not overlap (use 1, 6 or 11 for 2.4 GHz).

Is it possible to use a second router as a repeater via cable?

No, The repeater always works on Wi-FiIf you connected your router via cable, it can only work as an access point (AP Mode) or bridge (Bridge Mode).

Do I need to configure Wi-Fi channels on both routers?
Yes, but it is not necessary to use the same channelsIt's better to space them out to avoid interference. For example:
• Main router: channel 6 (2.4 GHz) and 36 (5 GHz).
• Second router: channel 1 (2.4 GHz) and 48 (5 GHz).

To select channels automatically, enable the option Auto Channel Selection (if your router has it).