Many people are familiar with the experience of their internet slowing down just when you're playing an online game or watching a 4K movie. Often, the problem isn't caused by a weak ISP plan, but by active network neighbors who are connecting to your Wi-Fi without your knowledge or simply consuming too much data. WiFi speed limitation — is an effective way to regain control of your network and ensure the stable operation of your devices.
Modern routers offer a wide range of tools for managing connected clients. You can not only completely block uninvited guests, but also set strict limits on throughput Channel allocation for each device separately. This is especially relevant for families where children download large files, or for offices where employees abuse streaming services.
In this article, we'll take a detailed look at how to configure traffic prioritization and force speed reduction for specific MAC addresses. We'll cover the settings using popular interfaces as examples and explain how the technology works. QoS (Quality of Service), which is key to the proper distribution of network resources.
Analysis of connected devices and identification of intruders
Before imposing any restrictions, you need to determine exactly who is hogging your bandwidth. Users often mistakenly suspect neighbors, when in fact, background updates to the operating system or smart TV may be consuming all of the bandwidth. Log into your router's administrative panel, usually accessible at 192.168.0.1 or 192.168.1.1You will need to find the section with the wireless network status or the client list.
The list displays all active connections with IP and MAC addresses. MAC address — This is a unique identifier for a network interface that doesn't change even if the IP address changes. Compare the list with your existing devices. If you see a device named "Unknown" or a model you don't have, this is cause for concern. However, even if it's your device, it could still be the source of the problem.
Pay attention to the "Receive Speed" (Rx) and "Transmit Speed" (Tx) columns. These indicators indicate the current channel load. If one device shows values close to the maximum speed for your plan, it is causing interference. In some advanced firmware, for example, OpenWrt or Mikrotik, you can see the history of traffic consumption for an hour or a day.
⚠️ Attention: Some smart devices (cameras, speakers) may not have a clear name in the client list. Don't block unknown devices immediately; first check to see if any of your smart devices will be disabled.
Blocking unwanted devices through MAC filtering
The most radical and simple way to restrict access is to completely disconnect the device from the network. This is done using the MAC filteringIt allows you to create a "blacklist" containing the addresses of violators, or a "whitelist" containing only approved devices. The latter option is more secure, but requires manual configuration of each new device.
To activate protection, go to the section Wireless (Wireless network) and find the subsection Wireless MAC FilteringEnable the feature and select "Deny" mode. Then add the MAC addresses of the devices whose speed you want to throttle. Once the settings are applied, the selected clients will immediately lose connection to the router, even if they know the password.
Using a whitelist is a more reliable method of perimeter protection. In this mode, the router ignores all connection requests except those from trusted addresses. This ensures that even if someone learns your WiFi password, they won't be able to connect without your physical presence and adding their device to the whitelist.
☑️ Network security check
QoS Configuration: Prioritizing Traffic for Important Tasks
If a complete block is not possible (for example, you need to give access to guests, but still be able to work), technology comes to the rescue QoS (Quality of Service). This feature distributes available bandwidth among clients. You can ensure that your laptop always receives at least 50% of the speed, regardless of other users' activity.
Find the section in your router settings Bandwidth Control or QoSHere you'll need to specify your overall bandwidth (upload and download) as provided by your provider. After that, you can create rules. For example, you could set the rule: "The device with IP 192.168.1.5 (your PC) receives high priority, and all others receive low priority."
Some routers, such as models from Keenetic or ASUS, have intelligent QoS systems. They automatically detect the type of traffic (games, calls, video) and prioritize it. With these systems, you simply drag a slider to reserve a portion of the channel for specific tasks, automatically limiting the speed of others.
Speed limit for guest WiFi network
The perfect solution for a party or office is to create Guest networkThis is a virtual WiFi network isolated from your main network. You can set strict speed limits for it so guests can comfortably use instant messaging apps but can't download files or watch heavy videos, which can disturb you.
The setting is made in the section Guest NetworkEnable guest access, set a separate name (SSID) and password. In the advanced settings of this profile, there's often a "Max Speed" slider. Set it to, for example, 5 Mbps. This will be enough for messaging on WhatsApp or Telegram, but downloading movies will be impossible.
A guest network also provides security, as guests cannot see your shared folders, printers, or NAS storage. This is a standard practice in the corporate segment, and it's becoming available in mid-range home routers.
| Type of restriction | Difficulty of setup | Efficiency | Impact on the network |
|---|---|---|---|
| MAC filtering (Blacklist) | Low | 100% (complete break) | The device turns off |
| QoS (Prioritization) | Average | High (speed guarantee) | Smoothing out load peaks |
| Guest network | Low | High (insulation) | Data security |
| Manual limitation (Bandwidth) | High | Exact (kbps) | Channel stability |
Manually configuring Bandwidth Control on different routers
If your router does not have smart QoS, but supports Bandwidth ControlYou can manually set limits. Interfaces vary between manufacturers, but the logic is the same. Let's look at an example of setting up a standard router. TP-Link And D-Link.
On the menu Bandwidth Control First, activate the feature. Then specify the IP address range. For example, if you want to restrict access to everyone except yourself, create a rule for the range. 192.168.0.100 - 192.168.0.200Set the Max Bandwidth in the Egress and Ingress fields. Values are specified in kilobits per second (Kbps). Remember that 1 Mbps = 1024 Kbps.
For routers Mikrotik a more complex mechanism is used through Queues (Queues). There you can create a Simple Queue, assign a Target (client IP address) and specify the desired speed in the Max Limit field, for example, 2M/5M (2 megabits for upload and 5 megabits for download). This provides maximum flexibility, but requires an understanding of network addressing.
⚠️ Attention: When manually calculating speed, be careful not to confuse Kbps and KB/s. Router settings almost always specify speed in bits. 1 byte = 8 bits. An error in calculations could result in your speed being reduced by eight times more than intended.
What to do if the router doesn't hold the settings?
If speed settings reset after a reboot, the router's memory may be running low or the firmware may be corrupted. Try resetting the device to factory settings and reconfiguring it. If the problem persists, the router's hardware may be too weak to process QoS rules under high load.
Compatibility issues and firmware features
Not all routers are equally good at limiting speeds. Budget models perform poorly when complex rules are enabled. QoS can significantly reduce overall processor performance. This results in an increase in overall network ping even with limited bandwidth for clients. In such cases, it's better to use simple MAC address filtering.
It's also worth considering that manufacturers are constantly updating interfaces. What worked in TP-Link Three years ago, Tether OS might be in a different location in the new green shell. If you can't find the feature you need, look for the "Traffic Manager," "Parental Control," or "Access Control" sections.
In some cases, providers use CGNAT technology, which can complicate remote management, but local speed limiting on the router works regardless of the provider. The main thing is that the device you use to manage the network has a stable connection to the router during setup.
Frequently Asked Questions (FAQ)
Is it possible to limit WiFi speed on a phone remotely?
Yes, if your router supports cloud management (e.g. via apps) Tether, Mi Wi-Fi, Keenetic). You can block a device or change the QoS priority from anywhere in the world where there is internet access.
Will my internet speed decrease if I limit my neighbor's internet?
No, your speed won't decrease; on the contrary, it will increase to the maximum rate, as the channel will be freed from excess load. Limiting the speed for others frees up resources for you.
What should I do if the internet connection disappears completely after setting up QoS?
You most likely entered the overall link speed incorrectly (indicated it was lower than it actually is) or blocked your IP address. Reset the router by pressing the Reset button (holding it for 10-15 seconds) and reconfigure it, carefully checking the Kbps/Mbps values.
Does speed limiting work if the user uses a VPN?
Yes, the limitation works at the device level (by MAC or IP), so the router "sees" the traffic volume regardless of whether it's encrypted within the VPN or not. Speed will be throttled in any case.