How to connect two routers via cable to increase Wi-Fi

Expanding wireless network coverage is a pressing issue for owners of large apartments, private homes, or office spaces. Often, a single device is simply not enough to provide a stable signal in a distant room or on the second floor, where concrete or brick walls effectively shield radio waves. In such situations, purchasing new, powerful equipment is not always the only or most practical solution.

Connecting two routers with twisted pair cable is a time-tested method that provides the most stable connection compared to wireless repeaters. Cabled connections are immune to electromagnetic interference from microwave ovens and neighboring networks and guarantee high data transfer rates. You can even use an old, but working router that's been collecting dust in a closet and turn it into a fully-functional access point.

In this article, we will look at two main connection methods: via ports LAN-WAN And LAN-LANThe first option is easier to set up for beginners, as it creates a cascade of two independent networks. The second requires a bit more knowledge but unites all devices into a single local network. The choice of a specific method depends on your goals: do you need the printer visible to all devices, or do you simply want to share the internet connection with a distant room?

Preparation of equipment and cable

Before you begin the physical wiring, you need to make sure you have all the necessary components. The key component will be a patch cord (network cable) long enough to run from the main router to the second device. If you plan to run the cable through walls or under baseboards, it's best to use Category 1 cable. Cat5e or Cat6 with copper conductors, as it provides better bandwidth and is less susceptible to signal attenuation over long distances.

The second router, which will act as a signal receiver and transmitter, must have working ports and a functioning Wi-Fi module. It doesn't matter whether these devices are from the same manufacturer (for example, two TP-Link or two Asus) or different brands. The main requirement is the presence of Ethernet ports with markings. LAN and, preferably, WAN (or Internet).

You'll also need a computer or laptop with a network card for initial address configuration. Before starting, it's recommended to reset the second router to factory settings to avoid conflicts with old configurations. This can be done by holding down the button. Reset on the back panel of the device for 10-15 seconds until the indicators blink simultaneously.

• 🔌 Patch cord (twisted pair) of the required length, preferably shielded for installation near electrical wiring.
• 💻 A computer or laptop for configuring IP addresses and operating modes.
• 📡 A second router that supports Wi-Fi standards no lower than 802.11n (preferably ac or ax).
• 🔧 Screwdriver or paperclip for reset button Reset.

⚠️ Caution: If you are using a cable laid inside walls, make sure that it does not have damaged insulation or sharp bends, otherwise the connection speed may drop to 10 Mbps or disappear completely.

LAN-WAN connection diagram (Cascade)

This method is considered the simplest and most versatile, as it doesn't require extensive knowledge of network architecture. In this setup, the main router assigns IP addresses to all devices, while the second router operates as a router, creating its own subnet. The physical connection is established by connecting a cable from the main device's LAN port to the WAN port (often blue and labeled as Internet) the second router.

With this configuration, devices connected to the second router will be on a different subnet. This means that if the addressing on the main router starts with 192.168.0.x, then it is better to set the range on the second one 192.168.1.xThis is necessary to prevent IP address conflicts when two devices try to assign the same address to different devices on the network.

The main advantage of the scheme LAN-WAN — network isolation. Devices connected to the first router won't be able to see devices connected to the second, which can be useful for security or traffic separation (e.g., a guest network). However, the downside is double NAT translation, which theoretically can slightly increase ping in online games, although for video streaming and surfing, this isn't noticeable.

To configure it, you'll need to log into the web interface of the second router. The login address is usually located on a sticker on the bottom of the router, most often 192.168.0.1 or 192.168.1.1. In the menu Network (Network) or LAN You need to change the IP address of the router itself so that it does not match the address of the main device. For example, if the main device has the address 192.168.0.1, ask the second one 192.168.0.254.

Setting up a second router in access point mode

A more advanced and technically correct method is to switch the second router to the mode Access PointsIn this mode, the device stops functioning as a router (distributing IP addresses and building routing tables) and simply becomes a cable extender, broadcasting a Wi-Fi signal. All devices in the home will be on the same local network, allowing for easy file sharing between computers and use of network printers.

Many modern models from Keenetic, TP-Link (Archer series) and Asus have a software switch for operating modes. In the interface of such devices, it is enough to find the section Opening hours or Operation Mode and select the item Access pointAfter applying the settings, the router will automatically disable the DHCP server and reconfigure the network interfaces.

If you have an older model or a budget device without this feature in the menu, you'll have to perform manual configuration. You'll need to go to Settings. LAN and change the IP address of the router to a free address from the main network range (for example, 192.168.0.2), and then find the section DHCP Server and select the option Disable (Disable). This is a critical step: only one DHCP server (on the main router) should be running on the network; otherwise, conflicts will arise and the internet will be lost on all devices.

After disabling the DHCP server on the second device, the cable from the main router (from the port LAN) must also be inserted into the port LAN second router. Port WAN In this design, the port remains free and unused. Thus, both devices act as switches, expanding the number of ports and the Wi-Fi coverage area.

• 🌐 Single space: all devices see each other, file sharing is possible over the local network.
• 🚀 No double NAT: ideal for online gaming, video calls, and torrents.
• 📶 Seamless (partial): You can set the same network name (SSID), although switching between routers will depend on the client.
• ⚙️ Flexibility: the ability to manage connected devices from one center (the main router).

Setting up a wireless network and channels

After physically connecting with a cable and setting up basic IP addresses, you need to properly configure the wireless network settings. To ensure that devices can automatically switch between routers (albeit with a disconnect, as full Mesh requires specialized hardware), it is recommended to set the same network name (SSID) and password on both devices.

However, simply copying the settings isn't enough. It's crucial to select the correct broadcast channels to prevent the routers from interfering with each other. If both devices broadcast on the same channel (for example, channel 6), this will result in reduced speed and increased ping. In the 2.4 GHz band, only channels 1, 6, and 11 are non-interfering.

It is recommended to set channel 1 on the main router and channel 11 (or 6) on the second one. Transmitter power (Tx Power) It's best to set the power on both devices to 100% or "High" if they are located a significant distance apart. If the routers are located close to each other, the power can be reduced to reduce interference.

For the 5 GHz band, the situation is simpler: there are many non-overlapping channels, and devices are better at choosing a free one. However, if you want maximum performance, you should also manually assign different channels, avoiding the "unrelated" mode. Auto, which sometimes works incorrectly with frequent changes in the radio airwaves.

Possible problems and their solutions

During setup, users often encounter a number of typical problems. The most common of these is an IP address conflict. If both routers have the default address 192.168.0.1, the network won't work. The computer will be confused about which device to access. There's only one solution: before connecting with a cable, connect to the second router separately and change its LAN IP to 192.168.0.2 (or another free one) and only then connect them.

Another common mistake is connecting the cable to the port. WAN The second router, when it's configured in access point mode (LAN-to-LAN configuration). In this mode, the WAN port is often disabled by software or operates differently. The cable from the main router must go directly to the port. LAN the second device. The port's LEDs should light up or blink, indicating a link.

You may also experience low internet speeds on the second router. This is often due to cable quality. If the cable is damaged, twisted, or made of copper-clad aluminum (CCA) over long distances, the speed can drop to 10-100 Mbps. Check the "Negotiated Speed" in the connection status on your computer: it should be there. 1000 Mbps (1 Gbit/s).

⚠️ Note: Router firmware interfaces are constantly being updated. Menu locations and item names (DHCP, LAN, Wireless) may differ from those described. Please look for the corresponding menu items in your device's menu or refer to the manufacturer's official documentation.

If you have internet access but your local network isn't working (you can't see your printer or files), check your firewall settings and network profile in Windows. When connecting to a new network, Windows may automatically set the profile to "Public," which blocks device discovery. Switch the profile to "Private" or "Home."

FAQ: Frequently Asked Questions