How to set up a local network via a Wi-Fi router

Creating a unified digital space in an apartment or office is no longer the domain of system administrators, but has become a daily necessity for the average user. local area network It allows you to instantly transfer files between computers, display your laptop's image on your TV, and play online games without lag. Many router owners mistakenly rely solely on cloud services, forgetting that direct data exchange within the router's perimeter is orders of magnitude faster.

The main difficulty users face isn't the physical connection, but rather the software security settings of their operating systems. Windows, macOS, and Linux block incoming connections by default for security reasons, considering the new network public and potentially dangerous. For your devices to "see" each other, Wi-Fi signal, it is necessary to perform a number of specific actions in the router interface and network adapter settings.

In this article we will look at the configuration process. LAN segment From protocol selection to port forwarding, you'll learn how to properly assign static addresses to ensure your printer is always accessible and your media server maintains connection with your TV after a reboot. Understanding these principles will allow you to build a fault-tolerant system independent of external servers.

Equipment preparation and compatibility testing

Before starting a deep setup, make sure your equipment supports the required encryption standards and data transfer protocols. Most modern routers, whether TP-Link Archer, Asus RT or Mikrotik, have a built-in switch that automatically routes traffic between wireless clients. However, for stable operation of the local network, it is critical that all devices are in the same frequency range.

A common mistake is trying to bridge devices connected to different frequency bands without proper bridging configured on the router. If your laptop operates on 5 GHz and your smart TV only sees 2.4 GHz, they may end up on different subnets despite using the same router. Check if this feature is enabled. AP Isolation (Access Point Isolation) in the wireless network settings must be disabled, otherwise the router will prohibit the exchange of packets between its own clients.

⚠️ Note: Some ISPs offer modems with built-in Wi-Fi that operate in double NAT mode. If you connect your router to such a device, make sure the ISP's equipment is set to "bridge" mode; otherwise, setting up a local network may be impossible without additional steps.

It is also worth paying attention to the version of the standard Wi-FiDevices that only support the older 802.11n standard can create a bottleneck when transferring large amounts of data at gigabit speeds. To ensure fast file sharing, it's advisable for key network nodes to support the standard. 802.11ac or Wi-Fi 6.

Basic router and DHCP server configuration

The foundation of any local network is proper addressing. By default, most routers act as DHCP servers, automatically assigning IP addresses to connecting devices from a pool, for example, from 192.168.1.100 to 192.168.1.199. This is sufficient for basic surfing, but for a stable local network, where computers must find each other using fixed addresses, this approach is ineffective.

You need to log into the router's web interface. This is usually done by entering the address 192.168.0.1 or 192.168.1.1 in the browser's address bar. After logging in, find the section responsible for LAN Setup or Network SettingsHere you can change the subnet mask, which for home networks should almost always remain 255.255.255.0Changing this setting without in-depth knowledge of network engineering will result in loss of connection with all devices.

It's recommended to reserve a pool of addresses for static assignment. For example, if your DHCP range starts at address 100, use addresses 2 through 99 for mission-critical devices. This ensures that your printer or NAS storage will not receive a new address after rebooting the router, and you will not have to reconfigure paths to resources.

What is a static IP and why is it needed?

A static IP address is a permanent digital identifier for a device on the network that doesn't change over time. Unlike a dynamic address, which the router assigns temporarily, a static address allows other devices to always find your computer or printer using the same "number." Without a static IP address, the address may change after the router is turned off, and network shortcuts will stop working.

The table below shows the recommended settings for setting up a basic home network:

Setting up static IP addresses for devices

After setting up the router, we move on to configuring the end devices. To ensure that computers and devices are always accessible via the same address, it's best to use the Address Reservation (address reservation) in the router itself. This method is more reliable than entering a static IP address in Windows settings, as it eliminates address conflicts.

Find the section in the router interface DHCP Server List or Client ListAll connected devices are displayed there with their MAC addresses and current IP addresses. Select the desired device (for example, a Smart TV) and click the "Reserve" or "Bind" button. Now the router will always assign a connection to this specific device. MAC address the same IP.

If for some reason setting up a router is not possible, you can enter a static address directly in the operating system. In Windows, this is done via Control Panel → Network and Internet → Network and Sharing Center → Change adapter settingsIn the protocol properties IPv4 Select "Use the following IP address" and enter the details manually, making sure the address is outside the DHCP range but within the same subnet.

When manually entering data, it's important to avoid numerical errors. An incorrect gateway will result in no internet access, and an incorrect subnet mask will result in the inability to see other devices on the local network. After applying the settings, run the command ipconfig /flushdns in the command line to flush the DNS cache and apply the new settings.

Managing Network Profiles and Discovery in Windows

Even with a perfectly configured router, Windows may block your computer's visibility. By default, the operating system assigns new connections to the "Public Network" profile, which hides your device from others. To use the local network, you need to change the profile to "Private."

Go to Settings → Network & Internet → StatusClick on your Wi-Fi connection properties and select the "Private" profile type. This will make your computer discoverable and open the necessary ports for public services. Without this step, pinging will work, but network folders will not be visible.

Next, you need to configure sharing settings. In the Network and Sharing Center, select "Change advanced sharing settings." In the "Private" profile, enable the options Network discovery And File and Printer SharingIt is also recommended to enable the "Let Windows manage HomeGroup connections" option if it is available in your OS version.

⚠️ Caution: Enabling network discovery in public places (cafes, airports) makes your folders visible to outsiders. Always ensure the "Private" profile is enabled only for trusted home networks.

To access shared folders on other computers, open File Explorer and enter in the address bar. \\192.168.1.X, where X is the address of the target computer. If the settings are correct, you will see available resources. For easy access, you can right-click the network folder and select "Mount as network drive," assigning it a letter.

Organizing file and printer sharing

The main purpose of creating a local network is to share a folder. To share it, right-click it, select "Properties," and go to the "Sharing" tab. Click "Advanced" and check the "Share" box. You can also configure permissions here: read-only or full control over files.

More flexible access control is available through the "Security" tab. Here, you can add a specific user or group (Everyone) and specify their permissions in detail. For example, "Read and Execute" permissions are sufficient for the media library, while "Modify" and "Write" permissions are required for the server work folder.

The situation is similar with network printers. On the computer to which the printer is connected (or which is the host for the router's USB printer), go to "Devices and Printers," right-click the printer, and select "Printer properties" → the "Sharing" tab. After enabling sharing, other network users will be able to add this printer via "Search for printers."

It's important to remember about passwords. By default, Windows requires the username and password of the remote computer account when attempting to access the network. To make life easier on your home network, you can disable the password prompt in "Advanced sharing settings" by finding "Password-protected sharing" and selecting "Disable." However, this reduces security.

Port forwarding and forwarding for games and servers

If you plan to run a game server (like Minecraft or CS) or access your home PC from outside, you will need to set up Port Forwarding (port forwarding). By default, a router blocks all incoming connections from the internet, acting as a firewall. Port forwarding creates an exception by redirecting requests from a specific port to a specific IP address within the network.

To configure, find the section in the router menu Virtual Servers, NAT or Port ForwardingYou will need to create a new rule, specifying: the external port (which the router will listen on), the internal port (which the application on the PC will listen on), the protocol (TCP, UDP, or Both), and the local IP address of the target device.

For example, a web server typically uses port 80, while a Minecraft game server uses 25565. After saving the rule, test it using an online port checker. Don't forget that an allow rule for this port should also be created in Windows Firewall on the computer itself.

⚠️ Caution: Forward only the ports that are truly necessary. Opening unnecessary ports, especially for remote management services (RDP, Telnet), creates serious security holes in your home network.

For advanced users, a mode is available DMZ (Demilitarized Zone). Enabling this mode for a single device completely opens it to all incoming internet connections, bypassing the router's firewall. Use DMZ only in extreme cases, such as when a game or application doesn't work via regular port forwarding, and only for devices with antivirus software installed.

Why isn't port forwarding working?

The problem often stems from your ISP using CGNAT technology, assigning you a "gray" IP address. In this case, port forwarding on your router won't help—you'll need to order a "Static IP" service from your ISP or use tunneling services.

Diagnostics and troubleshooting

During setup, situations may arise where devices cannot see each other. The first diagnostic tool is the utility pingOpen the command prompt and type ping 192.168.1.X (target device address). If "Reply from..." responses are received, the physical connection and basic addressing are working correctly.

If there's no ping, check your firewall status. Third-party antivirus programs (Kaspersky, ESET, Avast) often have their own built-in firewalls that can block the local network, even if the standard Windows firewall is configured correctly. Try temporarily disabling network protection in your antivirus to check.

Another common issue is different encryption levels or Wi-Fi standards. Make sure all devices are using the same security type, such as WPA2-PSK (AES)Mixed modes (WPA/WPA2) or the use of outdated TKIP encryption may cause connection instability and packet loss.

The table below lists the main symptoms and their solutions:

If software solutions don't help, try rebooting the entire hardware chain: turn off the router and all client devices, wait a minute, turn on the router, wait until it fully boots up, and only then turn on the computers. This will clear the ARP tables and resolve any network module freezes.

Questions and Answers (FAQ)

Is it possible to combine devices connected to different routers into one local network?

Yes, this is possible if you configure the second router in Access Point mode and connect them with a cable, or use WDS technology (bridge) if both routers support this function and are within sight of each other.

Is it safe to open ports for games?

Opening ports creates a potential attack vector, but the risk is minimal for modern games, as they use specific protocols. The key is to avoid opening ports for remote control services (RDP, VNC) and keep your software updated.

Why can't the TV see the computer but play the video?

The problem is most likely a video codec format unsupported by the TV, or insufficient Wi-Fi bandwidth for the heavy stream. Try lowering the video bitrate or using a wired connection to the TV.

How to find out the MAC address of a device for IP reservation?

In Windows, this can be done with the command ipconfig /all in the command line (physical address). On smartphones and TVs, the address is usually listed under "About device" → "Status" or "Network."

Do I need to set up a local network if I only use cloud services?

The cloud is sufficient for basic tasks. However, a local network is indispensable for quickly transferring large files (movies, backups) without internet speed or ISP restrictions, as well as for LAN gaming.