How to limit WiFi speed for other devices

Many users are familiar with the situation when a family member or guest "hogs" your entire bandwidth. You're trying to conduct an important video conference, while your roommate downloads terabytes of games, or your child starts streaming 4K, blocking your work. WiFi speed limitation becomes not just a whim, but a necessity for the stable operation of the network.

Fortunately, modern routers have built-in tools that allow you to flexibly manage data flows. You don't need to be a network administrator to set priorities. All you need to know is where to find the right sliders in your router's interface. routerIn this article, we'll explore how to reduce the speed of bandwidth-hungry devices while maintaining a comfortable internet experience for yourself.

Before we dive into specific figures, it's important to understand that traffic control isn't just about bans. It's about the fair distribution of resources. Speed ​​limiting does not break the connection, but only reduces the channel bandwidth for the selected client.This allows background tasks (updates, cloud sync) to run more slowly without interfering with the main user.

How QoS and Bandwidth Control Work

The fundamental technology that enables traffic management is QoS (Quality of Service)This feature is present in most modern routers, from budget ones Tenda to professional MikrotikIt allows you to classify data packets and assign them priorities. However, for simple speed reduction, the function Bandwidth Control or "Bandwidth Control".

The difference between them is significant. QoS is more often used to prioritize voice calls (VoIP) or gaming, ensuring minimal latency (ping). Bandwidth control works differently: it sets hard limits (speed limits) on downloads and uploads for specific IP addresses.

⚠️ Note: Router menu interfaces are constantly being updated. The location of settings may vary depending on the firmware version and model of your device.

Some manufacturers hide these settings deep in the menu, calling them by different names. For example, TP-Link This is often the "Bandwidth Control" section, Asus — "Adaptive QoS", and Keenetic — "Traffic Prioritization." It's important to find the section that allows you to set speed values ​​in kbps or Mbps.

Preparing for setup: static IP and MAC address

To ensure the restriction remains stable and doesn't reset after rebooting the offender's device, it's necessary to assign a permanent IP address to it. In standard mode DHCP server It assigns addresses dynamically: today the device receives 192.168.0.105, and tomorrow – 192.168.0.110. If you apply a limit to the first address, and the device receives the second, the rule will not work.

The process of linking an address to MAC address (unique identifier of the network card) is called static DHCP. You can find the MAC address in the list of connected clients on the router or in the settings of your smartphone or laptop. It usually appears as a sequence of 12 hexadecimal characters (for example, A4:C3:F0:89:12:BB).

After assigning the IP address, verify that the rule has been applied. Reconnect the device to the network and check the address it has received. If the address remains the same after rebooting the router, you've done everything correctly and can proceed to setting up limits.

Setup instructions for popular router models

Let's look at the steps for the most common brands. Interfaces may differ, but the logic remains the same. First, you need to log in to the control panel by entering the gateway address (usually 192.168.0.1 or 192.168.1.1) and entering login/password.

In devices TP-Link (new interfaces are blue or green) you need to go to the section Advanced Settings → Bandwidth ControlThere, you'll need to enable the feature and create a new rule. Enter the previously assigned address in the "IP Address" field, and specify the desired limit in the "Speed ​​Range" fields. Important: speed is often specified in kbps, so 1 Mbps equals 1024 kbps.

For routers Asus the path usually lies through Client Network → MAC Address Filter or through the tab QoS trafficIn new models with support AiMesh control can be carried out via a mobile application Asus Router, where you can simply drag the speed slider for a specific client in the list of connected devices.

U Keenetic (formerly Zyxel) the mechanism is called "Prioritization". Go to My Networks and Wi-Fi → Device ListSelect the desired device, click on it, and find the limit settings. Here you can set a guaranteed bandwidth or, conversely, a hard limit. In some firmware versions, this is located in the section Internet → Prioritization.

What if the menu is in English?

If your router doesn't support Russian, look for sections labeled Bandwidth, Limit, Control, QoS, or Rate Limit. Often, the fields you need are labeled Download (download speed) and Upload (upload speed).

Table of correspondence between speeds and units of measurement

One of the most common mistakes is confusing bits with bytes, and kilobits with megabits. ISPs advertise speeds in megabits (Mbps), but routers often require kilobits (Kbps) or even bytes. To avoid making a mistake and completely throttling your device, use the following table for conversion.

Please note that the values ​​in the table are rounded. Actual speed may vary slightly due to TCP/IP protocol overhead and radio signal quality. If you simply want to throttle the device while still allowing it to read text, set the value to around 256-512 kbps.

Guest network as an alternative method

If you don't want to mess around with IP addresses and complex rules, there is a simpler and more elegant way - Guest network (Guest Network). This feature is available in almost every modern router. It creates a separate Wi-Fi access point with its own name and password, completely isolated from your main network.

The advantage of a guest network is that you can often set global limits for it. You can set a maximum speed for the entire guest area. For example, you could allocate guests a total bandwidth of 5 Mbps. Even if they connect ten devices, they won't be able to download anything faster than this limit.

A guest network also improves security. Guests won't have access to your shared folders, network printers, or smart light bulbs. This is ideal for temporary visitors or smart home devices that don't require high speeds but still need internet access.

⚠️ Important: Make sure "Local network access" is unchecked in the guest network settings. Otherwise, guests will be able to see your files even if their internet speed is low.

Troubleshooting and diagnostics

It happens that you've set limits, but the user is still downloading at full speed. The first reason is that they're using mobile data (4G/5G) instead of Wi-Fi, and you're simply monitoring their activity through the router (which is impossible without specialized software). The second reason is a change in the MAC address.

Modern operating systems such as iOS (starting from 14) and Android (starting with 10) use the "Private Wi-Fi Address" or "MAC Randomization" feature by default. This means that each time the device connects to the network, it presents itself to the router under a new "name." Your rule associated with the old MAC address no longer applies.

To get around this, you need to either disable randomization on the specific device (select "Use device address" in the Wi-Fi network settings), or use more advanced filtering methods available in expensive routers that can track a device by hostname or certificate, although this is rare for the home segment.

FAQ: Frequently Asked Questions

Is it possible to limit the speed via phone?

Yes, if your router has a mobile app (e.g., TP-Link Tether, Huawei AI Life, Mi Wi-Fi). These often have a "Parental Control" or "Traffic Management" feature, which allows you to use a slider to reduce the speed for a specific device without accessing the web interface.

Will the user see that their speed has been reduced?

They won't receive any special notification. However, if the speed is very low, websites will take a long time to load, and videos will constantly buffer. An experienced user will recognize that the connection is throttled by checking the speed with Speedtest.

Will the setting reset after turning off the light?

No, all settings, including Bandwidth Control rules and IP address bindings, are saved in the router's non-volatile memory. After a reboot, the restrictions will resume automatically.

Does one device's speed limit affect others?

There's no direct impact, but there is an indirect one. By freeing up bandwidth from a "heavy" user, you increase the available speed for all other devices on the network, reducing the overall load on the router's processor and airtime.