How to increase the number of connections to a WiFi router: from settings to hardware

Modern homes are overflowing with gadgets: smartphones, tablets, smart light bulbs, TVs, and game consoles require stable internet access. Users often encounter a situation where a new device simply can't connect to the router, returning the error "failed to obtain IP address" or "access denied." This doesn't always indicate hardware failure; often, the problem lies in software limitations or incorrect network configuration.

Increasing the number of available slots for clients is a solvable problem, but it requires a comprehensive approach. It's important to consider not only software settings, such as the DHCP address pool size, but also the physical limitations of the radio module and the bandwidth of your internet connection. In this article, we'll cover all available network expansion methods, from basic interface settings to advanced frequency band manipulation.

Connection limit — this is the first thing to check. Many budget router models have strict limits on the number of simultaneously supported devices, built into the manufacturer's firmware. However, these limits can often be circumvented or optimized by properly distributing the load between the bands.

Analysis of current equipment limits and capabilities

Before making any changes, you need to understand what specific limitation you're facing. There's a difference between the number of devices that can be registered in the router's memory, and the number of devices that can transmit data simultaneouslyBudget models based on entry-level Realtek or MediaTek chips often choke with 10-15 active clients, even if the connection is formally established.

Check the specifications of your device. If you have a router of class AC1200 or lower, its processor may not be able to handle NAT tables for a large number of clients. At the same time, more expensive models that support the standard Wi-Fi 6 (802.11ax) use OFDMA technologies, which allow for the efficient servicing of dozens of devices simultaneously without loss of speed for each of them.

⚠️ Warning: Exceeding the router's hardware capabilities (processor overheating, memory buffer overflow) can lead to constant connection interruptions even for devices that were already connected to the network.

The connection type is also worth considering. Wired clients (via LAN) place virtually no load on the radio module, while each wireless device requires dedicated airtime. If you're aiming to connect multiple devices, use a cable whenever possible.

Expanding the DHCP address pool

The most common reason why new devices cannot connect to the network is the exhaustion of the DHCP address pool. DHCP (Dynamic Host Configuration Protocol) Automatically assigns each connected device a unique IP address from a specified range. If there are only 10 addresses in the pool and you try to connect an 11th device, it will be left without an address.

To resolve this issue, you need to log into the router's web interface. This is usually done at 192.168.0.1 or 192.168.1.1You will need administrator rights. Find the section responsible for local network settings, which is often called LAN, Local Network or DHCP settings.

You need to change the "Pool Size" or "End Address" parameter. The default range is often 192.168.1.100 — 192.168.1.199, which gives a total of 100 addresses. For home use, this is usually sufficient, but in offices or smart homes, it's better to expand the range to the maximum, for example, to 192.168.1.254.

After changing the settings, be sure to reboot the router for the changes to take effect. Also keep in mind that devices that previously received addresses will retain them until their lease time expires. To speed up the process, you can temporarily reduce the lease time to 1 hour and then return it to the default value.

Using the 2.4 GHz and 5 GHz bands

Modern dual-band routers allow you to split the load between the 2.4 GHz and 5 GHz frequencies. This isn't just a way to increase speed, but also an effective way to double the number of connected devices. 2.4 GHz longer range, but narrow and prone to interference, while 5 GHz provides higher throughput.

Many users leave the "Smart Connect" feature enabled. In this case, the router automatically decides which frequency to connect to. However, to maximize the number of connections, it's better to manually separate the networks by giving them different names (SSIDs), for example, HomeWiFi_24 And HomeWiFi_5GThis will allow you to manually assign devices: smart home and older gadgets to 2.4 GHz, and phones and TVs to 5 GHz.

Network segregation is especially important for Internet of Things (IoT) devices. Light bulbs, sockets, and sensors often operate only on 2.4 GHz, creating unnecessary noise in the air. By moving them to a separate guest network or isolating them within a single band, you free up your main network for important tasks.

Why don't older devices see 5 GHz?

The 5 GHz standard (802.11ac/ax) is not physically supported by older network cards manufactured before 2013-2014. If your laptop or phone doesn't see the 5G network, its WiFi module simply isn't capable of operating at these frequencies, and there's no software fix.

Setting up static IP addresses for critical devices

To ensure stable operation of a network with a large number of devices, it is recommended to reserve IP addresses for key clients. This is done using the function Static Lease or Address Reservation in the DHCP settings. Binding a device's MAC address to a specific IP address eliminates address conflicts and speeds up the connection process.

When a device is assigned a static address, the router doesn't need to waste time processing the request and searching for a free slot in the dynamic pool. This reduces the load on the router's processor. It also simplifies setting up port forwarding and setting up a local server.

You can find the MAC address in the connection properties on the device itself or in the router's client list (Status -> Wireless Statistics). Once you receive the address, enter it in the appropriate reservation settings field.

⚠️ Important: When setting up static IP addresses, make sure the selected addresses are within the subnet but outside the dynamic DHCP range, or use the reservation function to have the router automatically exclude them from the pool.

Using static IP addresses is especially useful for printers, network-attached storage (NAS), and video surveillance systems. These devices need to be accessible via a fixed address, and excluding them from the general DHCP queue improves overall network performance.

Optimization of channel width and signal power

Paradoxically, maximum signal strength and channel width do not always lead to an increase in the number of connections. Setting the channel width 40 MHz or 80 MHz At 2.4 GHz, this often leads to channel hijacking and increased noise levels. As a result, the router spends more time retransmitting packets, reducing the actual throughput for clients.

For the 2.4 GHz range, the optimal width is 20 MHzThis ensures better interference immunity. If there are many neighboring networks nearby, using a narrow channel will allow your router to operate more reliably, serving more devices without packet loss. For 5 GHz, you can safely set 40 MHz or 80 MHz, because there is more free space there.

Signal strength (Transmit Power) also requires adjustment. If the router is located in the center of the apartment, setting the power to "High" can create echo signals and interference. Try reducing the power to "Medium." This will force devices located further away to switch to another router (if you have several) or simply reduce the noise level, improving connection quality for everyone.

When to think about changing equipment

There are physical limitations that can't be circumvented through configuration. If your router was purchased more than 5-7 years ago, its architecture may simply not support modern, efficient multiple access protocols. Older standards 802.11n They work on a queue principle: a device waits for its turn to send data. The more devices, the longer the queue.

Technology MU-MIMO (Multi-User Multiple-Input Multiple-Output), which appeared in the standard Wi-Fi 5 (AC Wave 2) and developed in Wi-Fi 6, allows the router to communicate with multiple devices simultaneously, rather than one at a time. If you have more than 20-30 devices, upgrading to a router with Wi-Fi 6 support is the only effective solution.

It's also worth paying attention to the router's RAM capacity. For a large number of connections (50+), 256 MB of RAM is recommended. Budget models with 32-64 MB of RAM will constantly reboot or drop connections when trying to connect a dozen new devices.

In enterprise scenarios or very large homes with hundreds of devices, it is better to use a Mesh system or professional access points (e.g. Ubiquiti or Keenetic with a controller), which can balance the load between several network nodes.

Frequently Asked Questions (FAQ)

Can a provider limit the number of connected devices?

Yes, some providers may limit the number of simultaneous sessions in their residential plans or use NAT technology, which doesn't work well with large numbers of devices. However, most often, the limitation is caused by the router itself, not the provider. You can check this by connecting your computer directly to the provider's cable (if you're using PPPoE/L2TP) or by checking the number of active sessions in your account.

Does internet speed affect the number of connections?

Directly, no; the number of connections is limited by the router. However, indirectly, yes. If 20 devices simultaneously start downloading updates or watching 4K videos, the 100 Mbps channel will be clogged, creating the illusion that the network can't handle them. In reality, they're connected, but there's not enough bandwidth for anything.

Is it safe to increase the DHCP pool to 254 addresses?

Yes, it's completely safe. It's just a logical extension of the list of available numbers. The main thing is that the subnet mask (usually 255.255.255.0) allowed this. With a mask of /24, you can use addresses from 1 to 254.

Will changing your WiFi password help increase the number of connections?

Changing your password won't increase the technical connection limit, but it will disconnect all current users (as they'll have to re-enter the new password). This is a useful trick if you suspect neighbors have connected to your network and are hogging your slots.

What should I do if my router doesn't save settings after rebooting?

If your router resets settings after changing them (for example, DHCP extensions), the firmware may be corrupted or the device's flash memory may be exhausted. Try a factory reset (Reset) and reconfigure. If that doesn't help, you'll need to reflash the firmware or replace the hardware.