Creating a local area network (LAN) within an apartment or small office is a basic but critical task for efficient data management. When you have three computers, connecting them into a single system allows you to instantly share files, play online games, or use one PC's resources on other devices without using flash drives. Modern wireless technologies make this a quick and easy task, eliminating the need to run wires across the entire room.
However, despite its apparent simplicity, the setup process often encounters software blockages in the operating system or incorrect hardware configuration. Windows is configured for maximum security by default, which can interfere with normal operation in a home environment. You'll need to sequentially configure the router, network profiles on each of the three computers, and sharing settings to ensure the devices can see each other in the network environment.
In this guide, we'll walk you through every step of establishing a stable connection. We'll cover not only the standard steps in the Windows interface, but also the nuances of working with IP addresses and troubleshooting methods if one of your computers stubbornly refuses to appear in the list of available devices. Proper setup at the outset will save you hours of troubleshooting later.
Selecting equipment and preparing for work
The foundation of any wireless network is router (router). To connect three computers, you'll need a device that supports 802.11n, ac, or ax Wi-Fi standards. Make sure the router is turned on, working properly, and providing internet access. If you don't have a central router, you can theoretically create a computer-to-computer (ad-hoc) network, but for stable operation of three nodes, it's better to use a classic infrastructure setup via an access point.
All three computers must be equipped with Wi-Fi adapters. Modern laptops come with built-in Wi-Fi adapters, while desktop computers may require an external USB adapter or PCI-E module. It's important to update the drivers on all devices to the latest version, as older software versions often contain bugs that interfere with a stable local network connection.
Before you begin configuring the software, please perform a basic check:
- 📡 Make sure all three computers are connected to the same Wi-Fi network (same SSID name).
- 🔌 Check that antivirus programs do not block local connections at startup.
- ⚡ Make sure network discovery is enabled on all PCs.
- 📂 Create the folders you plan to share in advance.
⚠️ Note: If one computer is connected via cable (Ethernet) and the other two via Wi-Fi, they will still be on the same network, but the data transfer speed may be limited by the wireless channel. For maximum performance, it's best to connect mission-critical nodes via cable.
Basic router setup
Before setting up computers, you need to make sure the router itself is working properly. Access the device's web interface by entering the gateway address (usually 192.168.0.1 or 192.168.1.1). In the wireless network section (Wireless) Check if the DHCP server is enabled. This is what automatically assigns IP addresses to your three computers, making the networking process much easier.
If DHCP is disabled, you'll have to manually assign IP addresses to each device, which increases the risk of errors. Ensure the DHCP pool address range is sufficient. Also, pay attention to Wi-Fi security settings: use an encrypted protocol. WPA2-PSK or WPA3to prevent outsiders from connecting to your local network and accessing shared files.
What to do if DHCP is not working?
If automatic address assignment isn't available, you'll have to manually enter the IP address on each PC. Use the following scheme: 192.168.1.10, 192.168.1.11, and 192.168.1.12. Subnet mask for everyone: 255.255.255.0. Gateway: your router's IP address. This is a more labor-intensive approach, but it guarantees static addresses.
Some corporate or hotel chains may have customer isolation enabled (AP Isolation). This feature prevents devices connected to Wi-Fi from seeing each other. If you're setting up a network in such a location, you'll need to find "Allow AP Isolation" in your router settings and disable it; otherwise, computers will physically be unable to exchange data packets.
Setting up a network profile in Windows
The Windows operating system divides networks into "Public" and "Private." By default, when you first connect to a new Wi-Fi network, the system selects the "Public" profile, which hides your computer from other devices for security reasons. To create a local network between three PCs, you need to change this status to "Private" (or "Home" in older versions of Windows) on all three machines.
To do this in Windows 10 or 11, click the Wi-Fi icon in the system tray, select your network properties, and in the "Network Profile" section, toggle the switch to "Private." This will make your computer discoverable and allow connections to network devices, such as printers or other PCs.
After changing the profile, check the network status via the command line. Click Win + R, enter cmd and run the command:
netsh wlan show interfacesIn the command output, look for the "Network Type" line. If it says "Private," the setup was successful. If not, repeat the procedure. Without this step, Windows Firewall will block incoming connections, and you won't be able to see other computers.
Enabling Sharing and Discoverability
The next critical step is configuring sharing settings. Even with the correct network profile, Windows may block file sharing. Open Control Panel, go to Network and Sharing Center, and select Change advanced sharing settings. This is where you'll find the key settings for your three computers.
In the "Private" (current) profile, you need to enable the following options:
- 🔍 Enable network discovery.
- 💾 Enable file and printer sharing.
- 🔑 Allow Windows to manage HomeGroup connections (if applicable).
Pay special attention to the "All Networks" section. This is where you'll find the important "Password-protected sharing" setting. If you want files to be accessible to anyone connected to Wi-Fi (without having to enter a username or password), select "Turn off password-protected sharing." This is convenient for a home network, but it reduces security. If you want to control access, leave password-protected sharing enabled, but then you'll need to create identical accounts with the same passwords on all three computers.
⚠️ Important: Disabling password protection will allow anyone who connects to your Wi-Fi network to access your shared folders. Make sure your Wi-Fi password is secure and only known to trusted people.
After making changes, be sure to click "Save Changes." The system may require a reboot or restart of the Network Discovery service. Perform this procedure on all three computers participating in the network.
Port forwarding and firewall settings
Sometimes the built-in Windows firewall (Windows Defender Firewall) can be overly aggressive and block legitimate local network traffic, even if the profile is configured correctly. If computers can't see each other, check your firewall rules. In the "Windows Defender Firewall" menu, select "Allow an app..."
Click "Change settings" and make sure the following boxes are checked for your private network:
- 📁 File and printer sharing.
- 🖥️ Network discovery.
- 🔄 All media content controls.
If you're using a third-party antivirus (Kaspersky, ESET, Avast, etc.), its built-in firewall may be intercepting network control. In this case, Windows settings may be ignored. You'll need to go to your antivirus's firewall settings and add your home network to the trusted list, or completely disable the antivirus's firewall during diagnostics.
☑️ Firewall Checklist
For advanced users: If standard methods don't work, you can try resetting your network settings using the following command in the command prompt with administrator rights:
netsh winsock resetAfter running the command, a computer restart is required. This will clear the network settings cache and often resolve issues with stuck network adapters.
Expanding folder access and diagnostics
Once the technical details are set up, all that's left is to share specific folders. Select the folder, right-click, and select "Properties" → "Sharing" tab → "Advanced Setup." Check "Share" and add the "Everyone" group to the permissions, granting them read or read/write permissions. This folder will now be visible on the other two computers along the path. \\Computer_Name\Folder.
To diagnose problems, use the command pingOpen a command prompt on the first computer and enter the IP address of the second one (for example, ping 192.168.1.55). If you see the response "Reply from...," then there's a physical connection. If you see "Request timed out," the problem is at the network or firewall level.
Below is a table of problems and their solutions:
| Problem | Possible cause | Solution |
|---|---|---|
| Computers can't see each other. | Invalid network profile | Switch to "Private" |
| Password prompt upon login | Password protection is enabled | Disable in advanced settings or create a user |
| Low transmission speed | Weak signal or interference | Move your PC closer to the router or switch to 5 GHz |
| Access error "No rights" | Incorrect folder permissions | Add the "Everyone" user to the folder permissions |
⚠️ Note: Windows and router interfaces are constantly being updated. The layout of menu items may vary slightly between OS versions (Home, Pro) or router models (TP-Link, Asus, Keenetic). If you don't find an exact match, look for similar settings.
Frequently Asked Questions (FAQ)
Is it possible to connect computers into a network without a router?
Yes, this is possible by creating an ad-hoc network (computer-to-computer) or using the "Mobile Hotspot" feature in Windows 10/11. However, one of the computers must constantly act as a Wi-Fi server, which is inconvenient for three-node setups. The stability of this connection is lower than using a router.
Why can't the third computer see the first two?
Most often, the problem is that the third PC forgot to change the network profile to "Private," or the antivirus is blocking the connection. Also, check that the workgroup name is the same on all three machines (WORKGROUP by default).
Does internet speed affect file transfer speed over a local network?
No, internet speed and local area network (LAN) speed are different parameters. Files are transferred directly between computers via the router, without going over the global network. Speed depends only on the Wi-Fi standard (n/ac/ax) and signal quality.
How do I find out the IP address of another computer on the network?
On the target computer, open the command prompt (cmd) and enter the command ipconfigYou're interested in the "IPv4 address" line. Alternatively, in Windows networking, the computer name is often displayed instead of the IP address, but for a direct connection, it's better to know the numeric address.