How to use Wi-Fi and wired internet simultaneously

Many users face a dilemma: they want to connect smart devices wirelessly, but their PC requires maximum stability via a cable. A common scenario is when the router stops transmitting a signal if a provider's cable is plugged into the WAN port, or the computer ignores the local network when Wi-Fi is active. This isn't magic, but rather a quirk of network protocols that can and should be adjusted.

There are several scenarios where you need two connection types working simultaneously. For example, you might want to share internet access via Wi-Fi to a set-top box via a LAN cable, or vice versa—receive a signal via a cable and broadcast it further. Correct configuration allows you to combine the benefits of speed and mobility without purchasing expensive equipment.

In this guide, we'll cover configuration methods both at the Windows operating system level and through the router interface. You'll learn how to avoid IP address conflicts and configure traffic prioritization. The key is to separate networks into different subnets so that the system understands where to route requests.

Using a PC as a bridge between Wi-Fi and LAN

The most common way to set up simultaneous work is to turn a laptop or system unit into a kind of switch. If your computer has built-in Wi-Fi and a free Ethernet port, you can receive internet over the air and transmit it via a cable, or vice versa. Windows has a built-in function for this. Bridge (Bridge).

To create a bridge, you need to open the Network and Sharing Center. Click Win + R and enter the command ncpa.cplIn the window that opens, you'll see all available adapters. Select two connections with your mouse: wireless and wired. It's important that both have a working connection, or at least one has an active internet connection.

After selecting both adapters, right-click and select "Create Bridge." The system will automatically create a new virtual adapter. Traffic will now flow through the computer, connecting the two network segments. Interface metrics In this case, it is configured automatically, but if necessary, it can be changed manually in the TCP/IP properties.

⚠️ Warning: When creating a bridge, your antivirus or firewall may block data transfer between interfaces. Make sure network discovery is enabled for private profiles in your security settings.

This method has its limitations. The computer must be constantly on and not go into sleep mode, otherwise the network connection for LAN-connected devices will be lost. Furthermore, the transfer speed may be limited by the performance of the PC itself and the speed of the Wi-Fi adapter.

Setting up a router in repeater or client mode

If you don't want to keep your computer on 24/7, it's more logical to delegate this task to a specialized device. Many modern routers, especially those with firmware Keenetic, Asus or MikroTik, can operate in client mode. In this mode, the router connects to the main Wi-Fi network like a regular device, but then distributes internet through its LAN ports.

Configuration is typically done through the device's web interface. Find the operating mode section and switch it from "Router" to "Repeater," "Client," or "Bridge." Afterward, the device will scan the airwaves, and you can select the network from which to receive the signal. This is ideal for those who want to connect a Smart TV or gaming console in a room without a LAN outlet but still have Wi-Fi.

It is important to understand the difference between the modes. In the mode WDS bridge Client MAC addresses are transparently transmitted, which may be a requirement of the ISP. In router mode, the second device will have its own local network (double NAT). For most home applications, such as online gaming or streaming, client mode with port forwarding or a DMZ on the main router solves all problems.

It's worth noting that when operating in repeater mode, the wireless connection speed may be reduced by half, as the radio module is both receiving and transmitting data. Using a wired connection from the repeater to the end device compensates for this loss, ensuring a stable ping.

Connecting to two different networks simultaneously on Windows

A common situation: you need to work on a corporate network via Wi-Fi, but access to file storage or a printer is only possible via a LAN cable connected to another router. By default, Windows may ignore one of the interfaces if it deems it a lower priority or if there is a gateway conflict.

For proper operation, you must manually enter static routes. Open the command prompt as administrator. Enter the command route printto view the current routing table. You'll see a list of networks and interfaces. Your task is to tell the system which interface to use to send requests to specific IP addresses.

The command is used route addThe syntax is as follows:

route -p add 192.168.2.0 mask 255.255.255.0 192.168.1.1 metric 1

Here -p means that the route will be saved after reboot Address 192.168.2.0 — this is the network that needs to be accessed, and 192.168.1.1 — the gateway (IP address of the router) through which to go. Metrics determines the priority: the lower the number, the higher the priority.

Without manual intervention, Windows can attempt to route all traffic through the interface with the highest speed or the one that was most recently connected. Properly configured routing tables allow for separate data streams: video calls go through one channel, and heavy file downloads through another.

What is an interface metric?

A metric is a numerical value that Windows uses to determine the priority of a network connection. If you have multiple active connections, the system will choose the one with the lowest metric. Automatic detection doesn't always work correctly in complex setups with two routers.

Setting up Dual WAN on a router

For advanced users and small businesses, the issue of combining two providers is relevant. Function Dual WAN (or Multi-WAN) allows you to connect two cables from different providers or one cable and one USB modem. The router automatically distributes the load or switches to a backup channel if the primary one fails.

Implementation depends on the hardware model. Budget home routers often lack this feature or have limited functionality (redundancy only). Professional devices allow you to configure load balancing policies. For example, you can set a rule to download torrents through provider A, while web surfing and gaming are routed through provider B.

In the router settings, you need to specify which ports function as WAN. LAN4 is often used for the second channel, which can be reassigned programmatically. After connecting the cables, select the operating mode in the Dual WAN settings menu: "Failover" or "Load Balance."

When using load balancing, access issues may arise with banking websites or services sensitive to IP address changes. In such cases, it is recommended to use fallback mode or configure exceptions for specific addresses.

Resolving IP address and gateway conflicts

The main technical problem when using two networks simultaneously is IP address conflicts. If your home router distributes addresses in the range 192.168.0.x If the office network you're connected to via Wi-Fi uses the same band, chaos will ensue. The computer won't know where to send the data packets.

To resolve this issue, you need to change the IP address of one of the devices. Go to the router settings (usually at 192.168.0.1 or 192.168.1.1) and find the section LAN Settings. Change the third octet of the address, for example, to 192.168.5.1After rebooting the router, all devices connected to it will receive addresses from the new subnet.

It's also important to monitor DHCP servers. Only one DHCP server should be running on a single local network (or in a bridged configuration) distributing addresses. If there are two, devices will constantly reconnect or receive incorrect gateway settings, resulting in internet access loss.

⚠️ Note: Changing your router's IP address will require you to re-enter its settings using the new address. Make a note of the new settings before making any changes.

You can check the current settings via the command line with the command ipconfig /allPay attention to the "Default Gateway" and "DNS Servers" lines. If there are multiple gateways listed, the system will use the one with the lower metric, which may not be obvious to the user.

Impact of drivers and hardware on stability

Don't discount the hardware. Cheap USB Wi-Fi adapters often can't handle the simultaneous load, especially when used for internet access. They can overheat, drop connections, or throttle speeds. For a stable bridge, it's better to use integrated modules or high-quality PCIe cards.

Network card drivers also play a crucial role. Outdated software may incorrectly handle packet priorities or fail to support certain power-saving features, causing the adapter to constantly fail. It's recommended to download drivers from the official websites of motherboard or network card manufacturers rather than relying on automatic Windows installation.

You can prevent the system from turning off your network adapter to save power in Device Manager. Find your adapter in the list, open its properties, and under the "Power Management" tab, uncheck "Allow the computer to turn off this device." This will prevent micro-interruptions in connection.

Frequently Asked Questions (FAQ)

Is it possible to download files from two different internet channels at the same time?

Yes, this is possible using the Load Balance feature on your router or specialized software on your PC that can bond channels. However, simply connecting two cables without any configuration will not automatically double your browsing speed.

Why does the internet on my phone disappear when I plug the cable into the computer?

Your router likely prioritizes the wired connection by default and disables the Wi-Fi module to save resources or due to a settings conflict. Check the "Wireless" section of your router settings; there should be an option to "Enable wireless" regardless of the LAN status.

Will Wi-Fi speed decrease if LAN is running at the same time?

On modern gigabit routers, the speed drop is unnoticeable, as the device's processor can handle the streams. On older or very budget models, when the LAN port is heavily loaded, Wi-Fi speed may drop due to a lack of processing power.

Do I need to buy a second router to create a bridge?

Not necessarily. If you have an old router, you can reflash it or configure it in client/repeater mode. A computer with two network interfaces can also successfully act as a bridge, although this is less convenient to use.