The question is how many devices can connect to a wireless network at the same time Mikrotik, is one of the most common issues when designing networks. Beginners often confuse theoretical throughput with the actual number of connections, leading to network instability in offices or apartment buildings. Real performance depends not only on the processor power, but also on the type of user activity.
It's worth noting right away that the term "client" in the context of WiFi has two meanings: the number of associated devices and the number actually transmitting data. A router can have hundreds of devices in its association list, but if they remain silent, the network operates reliably. However, as soon as active packet transmission begins, restrictions come into play. airtime and computing power.
In this article we will take a detailed look at which models Mikrotik Suitable for large crowds, how to properly configure limits, and why cheaper models can't handle 50+ active users. You'll learn about hidden license limits and optimization techniques that will extend the life of your equipment.
RouterOS Technical Limitations and Licenses
The first thing an administrator faces when planning a large-scale network is the software limitations of the operating system. RouterOSThe license determines not only the functionality, but also the maximum number of users that can be authorized through the mechanism. HotSpot or PPPoE. For general home use or small office where a simple WPA2-PSK, these limits are often irrelevant, since the limitation comes from the hardware side.
However, if you're building a network for a hotel or cafe with web-based authentication, the license level becomes critical. The basic Level 3 license allows for up to 50 concurrent HotSpot users. This might be sufficient for a small coffee table, but not for a conference room. Higher levels, such as Level 4 or Level 6, remove these limitations, allowing for hundreds or thousands of clients, but require the purchase of an appropriate license.
β οΈ Attention: The license limits the number simultaneous Authorization sessions. If you have Level 3 (50 users), the 51st client simply won't be able to log in until one of the first 50 disconnects or their session times out.
In addition to software limits, there is a limit on the number of entries in the ARP and DHCP tables. By default, Mikrotik These tables can hold thousands of records, but filling them to capacity begins to consume a significant amount of RAM. Random Access Memory (RAM) is a bottleneck for storing the state of all connected clients.
How to check the license level?
To find out your router's license level, go to System -> License. It will say Key: Level X. You can also use the terminal command: /system license print.
Dependence of the number of clients on the equipment model
Selecting a model Mikrotik directly dictates how many devices can comfortably operate on your network. Budget models, such as the series hAP lite or old ones RB750, are equipped with weak processors with a frequency of 600-800 MHz and a single core. Such devices are physically unable to process packets from a large number of clients, even if they are simply connected to the network.
For High Density scenarios, series are used Cloud Router Tile (CRS) with chips Marvell or powerful routers of the series RB5009 And RB4011These devices feature multi-core processors (ARM 64-bit) and hardware-accelerated switching. They are capable of keeping tens or hundreds of clients online, distributing the load across cores.
It is important to distinguish between models that support the standard WiFi 5 (ac) And WiFi 6 (ax)New standards, such as WiFi 6, implement OFDMA technology, which allows a router to communicate with multiple clients simultaneously in a single time slot. This radically changes the approach to the "how many clients" question: where an older router would be overwhelmed by 20 devices, a new one Mikrotik With WiFi 6 it will easily serve 100.
Below is a table showing the approximate number of clients for different usage scenarios depending on the hardware series:
| Device series | Example of a model | Office/Home (mixed traffic) | Public WiFi (web surfing) |
|---|---|---|---|
| Entry Level (Lite) | hAP lite (RB941) | 5-10 devices | 10-15 devices |
| Mid-Range (ARM 32-bit) | RB4011 / hAP ax2 | 30-50 devices | 60-80 devices |
| High-End (ARM 64-bit) | RB5009 / hAP ax3 | 60-100+ devices | 150-200+ devices |
| Carrier Grade | CCR series / CAP AX | 200+ devices | 500+ devices |
The problem of airtime and "slow" clients
The biggest problem in WiFi networks is not the router's processor, but the physics of radio waves. There is a concept airtimeWiFi is a half-duplex environment where devices take turns speaking. If one "slow" device (for example, an old smartphone with a poor signal or using the 802.11b/g standard) connects to the network, it occupies the airwaves for a long time to transmit a small amount of data.
While the "slow client" transmits its packet, all others, even the fastest WiFi 6 laptops, are forced to wait silently. This phenomenon is called the "slow client effect." As a result, the throughput of the entire cell drops drastically, even if the processor Mikrotik It's only 5% loaded. That's why the number of clients is often limited not by CPU power, but by airwave pollution and the presence of outdated standards.
To combat this, you need to properly configure your wireless network profiles. In the interface Wireless or WiFi (in the new configuration scheme) support for legacy standards should be disabled unless they are absolutely necessary. Forcing the network to switch to the only-ac or only-ax frees the airwaves from slow transmissions.
β οΈ Attention: Disabling older standards (b/g/n) may cause some IoT devices (smart light bulbs, older printers) to stop connecting. Always check your device fleet before changing settings.
supported-rates.
Signal strength is also critical. Clients with a signal strength below -75 dBm begin to reduce connection speed, occupying the airwaves longer. Setting the minimum registration threshold (registration-table) allows you to cut off devices that are too far away or behind thick walls, forcing them to look for another access point with a better signal.
Setting up an Access List for load management
Tool Access List V Mikrotik It's a powerful tool for monitoring the quantity and quality of connections. It can be used not only to deny access, but also to prioritize traffic, limit speeds, or redirect clients to other frequencies. This allows for artificially regulating the load on the access point.
For example, you can create a rule that limits the speed of all devices whose signal strength is worse than -70 dBm. This will prevent a single, distant client from slowing down the entire network. Rules are applied from top to bottom, so the order in which they appear matters.
/interface wifi access-list
add comment="Limit weak signal clients" signal-range=-120..-70 action=reject
add comment="Allow strong signal" signal-range=-69..0 action=accept
Additionally, the Access List allows you to separate clients by MAC address. You can create a separate SSID for high-priority employees and a guest SSID with strict speed limits. For the guest network, you can set a rule limiting the number of simultaneous connections from a single MAC address, preventing multiple personal devices from connecting to the same user.
βοΈ Setting up Access List
Optimization: Channel Width and Frequency Ranges
To increase the number of clients served, it's often recommended to use the 5 GHz band instead of the congested 2.4 GHz band. The 2.4 GHz band has only three non-overlapping channels, making it impossible to deploy a dense network without interference. The 5 GHz band offers many more channels and allows for wider bandwidths.
However, using the maximum channel width (80 MHz or 160 MHz) isn't always a benefit for a large number of clients. A wide channel quickly becomes clogged with noise and takes up more spectrum. In high-density scenarios, such as conference rooms, it's often more efficient to use channel width. 20 MHz or 40 MHzThis allows for the deployment of more independent access points on different frequencies, increasing the overall network capacity.
DFS mechanism (Dynamic Frequency Selection) allows the use of additional channels in the 5 GHz band, which are typically occupied by radars. Enabling DFS in the settings Mikrotik (dfs-mode) significantly expands the range of frequencies, allowing you to avoid interference with neighboring networks. However, remember that when radar is detected, the router is forced to change channels, which will cause a brief connection interruption.
Monitoring and identifying bottlenecks
Understand if your goal has been achieved Mikrotik limit for clients, can only be achieved through monitoring. Standard graphs in Graphs show overall CPU load, but not the load on a specific radio interface. For a more in-depth analysis, you need to use a tool Torch or built-in interface counters.
Pay attention to the parameter CCQ (Client Connection Quality). If the average CCQ across the network drops below 50-60%, this is a sign that the airwaves are overloaded, and adding new clients will lead to a collapse. It's also worth monitoring the number of retransmissions (retries). A high percentage of retransmissions indicates a poor signal or interference, which indirectly limits the number of users.
For professional analysis of large networks, it is recommended to use external monitoring systems such as The Dude (who can also Mikrotik) or ZabbixThey allow you to collect SNMP metrics for each connected client, monitor association uptime, and signal strength over time. This helps identify problematic users who constantly reconnect and create a broadcast packet storm.
β οΈ Attention: The management and configuration interfaces may differ between versions of RouterOS (v6 and v7). In v7, the package
wificompletely redesigned and calledwifiwave2or simplywifi, while v6 uses the packagewirelessMake sure the instructions match your software version.
FAQ: Frequently Asked Questions
How many clients can Mikrotik hAP ac lite support?
Model hAP ac lite The RB952Ui-5ac2nD has a weak single-core 650 MHz processor. It works comfortably with 5-10 active clients. Trying to connect 20+ devices will result in significant lag and connection drops, especially if someone is running torrents or video streaming.
How to increase the number of clients without replacing the router?
You can try disabling older WiFi standards (b/g), reducing the channel width to 20 MHz, disabling unused services (such as UPnP or cloud features), and setting strict speed limits (Queue Simple) for each user.
Does RouterOS version affect the number of clients?
Yes, indirectly. Newer versions (v7) are better optimized for multi-core processors and modern WiFi 6 (ax) standards. However, on older hardware (for example, MIPSBE architecture), upgrading to v7 may actually reduce performance due to increased system requirements.
What to do if clients keep dropping out?
Check the logs (Log) for association errors. Often, the problem isn't the number of channels, but rather channel interference or a signal cutoff threshold that's too low. Try changing the channel to a clearer one and increasing the transmit power only to the minimum necessary to avoid clogging up the airwaves for neighboring channels.