When a third-party device connects to your home network, it is one of the most common digital security issues. A stealthy intrusion can significantly reduce the speed of your Internet connection, and compromise the privacy of your personal data. Xiaomi equipment owners often face the need to quickly restrict access to unwanted guests without changing the complex settings of the router manually.
Modern routers, such as the popular Mi Router 4A or Mi Router AX3600, are equipped with powerful software that allows you to manage connections flexibly. The main control tool is in the Mi WiFi mobile application, which turns a smartphone into a remote control of the entire network infrastructure. In this article, we will discuss in detail the algorithms for identifying and blocking troublemakers.
Before you go to radical measures, such as a complete password change, you should use built-in filtering functions, which will allow you to pinpoint the specific device, saving the settings for all other gadgets in the house. MAC-Filtering and blacklisting will help you keep your network under full control.
Identifying connected devices via Mi WiFi
The first and most important step is to find someone else’s device in the list of active customers. Mi WiFi provides comprehensive information about who is currently using your traffic. To get started, you need to log in to the application associated with your Mi Account and go to the main control screen of the router.
The central bar shows the number of devices connected, and if you click on that number or select the Device Management menu, you'll see a detailed list. IP-addresses, but also the names of models of gadgets, as well as their MAC-If you see a device called "Unknown" or a name you don't know, that's a cause for concern.
- 📱 Name Checker: Compare device names to the list of gadgets in your family (TVs, phones, laptops).
- 🔍 Activity Analysis: Pay attention to the data rate indicator near each device – suspiciously high activity may indicate that third parties are downloading content.
- 📡 Connection type: Clarify if the device is running at 2.4GHz or 5GHz to understand the physical proximity of the "intruder».
It is important to note that some smart devices, such as IoT gadgets (light bulbs, sockets), can be displayed with the technical names of chip manufacturers.Before blocking them, make sure that this is not your own smart vacuum cleaner or surveillance camera.
Locking the device through a blacklist
Once you have identified an uninvited guest, you need to turn it off immediately, and the most effective way to do that is to put the device on the Blacklist, which will prevent the router from issuing any information. IP-The address of the device, even if it knows the correct password from WiFi.
To perform this procedure, in the Mi WiFi app, select a suspicious device from the list. In the properties menu that opens, find a switch or button that says "Block" or a shield icon. The system may request confirmation of action, as this is a critical security operation.
☑️ Locking algorithm
Once locked, the device will disappear from the active connections list, and if you try again, the router will simply ignore its request, which is the most civilized way to solve the problem, without requiring you to change passwords and reconnect all your personal gadgets.
⚠️ Note: If the locked device belongs to you (for example, you made a mistake in choosing), you can only unlock it by entering the router settings through the web interface or finding the “Blocked devices” item in the application.
Filtering settings by MAC-address
A more advanced method of access control is the use of filtering by MAC-Every network adapter in the world has a unique identifier that's stitched in the factory. Xiaomi routers allow you to create permission lists that only have trusted addresses.
Unlike a simple lock, Whitelist mode works on the principle of “all that is not forbidden”, but the opposite is true: “all that is not allowed is prohibited”, if you turn on this mode, no new device will be able to connect to your network, even if you give it your password.
To configure this setting, you need to go to the advanced WiFi settings in the application or web interface at 192.168.31.1 «MAC-Select the "Allow only listed devices" mode and add MAC-addresses of all your gadgets.
Where to find out. MAC-address?
Use of the MAC-Filtering requires care, and if you buy a new phone or you have guests, you have to manually list their addresses, otherwise they won't have the Internet, which creates an extra layer of security, but reduces usability.
Change password and reboot the network
If you suspect that your password has been compromised or shared with too many people, the most reliable solution is to change it completely, which will force all devices to be disabled, and only those to whom you give the new code can be re-authorized.
In the Mi WiFi app, go to your WiFi settings, select your current network, and click on the password field. Enter a complex combination of letters and numbers. It is recommended to use WPA2/WPA3 encryption, which is the security standard for modern networks.
| Parameter | Recommended value | Safety impact |
|---|---|---|
| Type of encryption | WPA3-Personal | Maximum protection against selection |
| Password length | 12+ characters | Increases the time of hacking |
| SSID cover-up | Off. | Reduces the visibility of the network |
| Guest network | On. | Isolates guests from the main network |
Once you change your password, the router may require you to reboot to apply the changes, at which point all devices will lose connection, you'll have to re-enter the password on each of them, which is inconvenient, but it ensures that the stranger won't get access anymore.
⚠️ Note: Do not use simple passwords like “12345678” or date of birth.
Use of guest WiFi mode
A great solution for temporary access by friends or relatives is the Guest Network feature, which creates a separate hotspot with its own name and password, which is isolated from your main home network.
Guests connected to such a network will have access to the Internet, but will not be able to see your computers, printers or other devices. NAS-It's the perfect trade-off between hospitality and security. In the Mi WiFi app, it's activated by a single switch.
You can set time limits for the guest network, like speed limits or opening times, and when guests leave, you can simply turn off the guest network, and you don't have to change the password from the main WiFi.
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Use it. QR-Guest code. Mi WiFi can be generated QR-code that guests can scan with their phone’s camera for instant connection without entering a password.
Additional protection measures for the Xiaomi router
To prevent unauthorized access from happening again, it is important to ensure that the router itself is protected in a comprehensive manner, and users often forget to change the password from the control panel, leaving the standard one, which allows hackers to change the network settings.
Go to the router system settings and find Administrator Password. Set up a complex code that differs from the WiFi password. It is also recommended to disable WPS, as it is a vulnerability in many router models and makes pin code easy to pick up.
Remember to update the router's firmware regularly. Xiaomi engineers are constantly releasing patches to close security holes. You can set the update automatically through the app.
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Comprehensive protection includes not only locking devices, but also changing the administrator password, disabling WPS and regularly updating the firmware.