A stable internet connection is now a critical infrastructure for work, education, and entertainment. When the connection is interrupted or the speed drops to unreadable levels, immediate diagnostics are necessary. Checking the functionality of the WiFi network — this is not just an attempt to access a website, but a complex process of analyzing signals, equipment, and software.
In this article, we'll explore professional testing methods that will help identify bottlenecks in your local network. You'll learn how to distinguish between ISP issues and router malfunctions and how to correctly interpret ping and jitter data.
Initial diagnostics always begin with a visual inspection of the equipment. The indicators on the router's body can tell you more about the system's status than meets the eye. If the indicator is blinking WAN or Internet, this indicates a loss of connection with the provider.
However, if all the lights are on but the internet is not working, the problem may be a software glitch or overheating of components. Rebooting the router often solves the problem of accumulated errors in the device's RAM.
It's also important to check the physical location of the equipment. A router hidden in a recess or behind metal objects will transmit a weak signal. Metal surfaces and mirrors are a serious obstacle to radio waves.
⚠️ Caution: If the router case gets very hot (above 60 degrees Celsius), this may cause processor throttling and sudden connection drops. Ensure the device has adequate ventilation.
The fastest way to check the connection status at the operating system level is to use built-in utilities. In Windows, this is the command ping, which sends data packets to a specified address and measures the response time.
To run diagnostics, open a command prompt by typing cmd in the Start menu. Enter the command ping 8.8.8.8 -t to continuously check the connection with Google servers. This will allow you to see the stability of your connection in real time.
If you see "Request timed out" messages, it means packets are being lost. High response times (over 100 ms for home internet) indicate channel congestion or a poor signal. Packet loss critical for video calls and online gaming.
Deciphering Ping Results
Time is the delay in milliseconds. TTL (Time To Live) is the packet's lifetime. If the TTL drops sharply, the packet may be passing through unnecessary nodes or the router may be configured incorrectly.
When analyzing results, pay attention not only to the average time but also to the range of values. Sharp jumps from 20 ms to 500 ms are called jitter, and they are often more annoying to users than simply a high but stable latency.
For a more in-depth analysis, it's necessary to evaluate the radio signal quality at different points in the room. Signal strength is measured in decibels (dBm) and is a negative number. The closer the value is to zero, the better the signal.
The ideal range is considered to be between -30 and -50 dBm. Values below -70 dBm are considered weak and may lead to a decrease in speed. Mobile apps like WiFi Analyzer or built-in OS tools.
It's also important to check the frequency your network operates on. The 2.4 GHz band has a longer range, but is slower and more noisy. 5 GHz Provides high speed, but is worse at passing through walls.
| Signal level (dBm) | Connection quality | Recommended use |
|---|---|---|
| -30 ... -50 | Excellent | Any tasks, 4K, VR |
| -50 ... -60 | Good | Streaming, work, calls |
| -60 ... -70 | Average | Web surfing, mail |
| -70 ... -80 | Bad | Text only, interruptions may occur |
| Below -80 | Critical | The connection is unstable or absent |
A common cause of low speeds is airwave congestion from neighboring routers. If your router is operating on the same channel as your neighbors' devices, data collisions occur.
You can check channel congestion using specialized software. Find a free or least congested channel and switch the router to it via the web interface. This is usually done in the [channel name] section. Wireless Settings.
In the 2.4 GHz band, it is recommended to use only channels 1, 6, and 11, as they do not overlap. Using intermediate channels (such as 3 or 4) creates additional interference for all network participants.
☑️ Interference diagnostics
If your local network is working perfectly but there's no internet connection, the problem may be with your ISP or DNS settings. First, try accessing the website by IP address, for example, http://142.250.185.206 (one of Google's IPs).
If the site opens by IP, but not by name, then the problem is DNS serversIn this case, it is recommended to enter public DNS from Google (8.8.8.8) or Cloudflare (1.1.1.1) in the router or computer settings.
It's also worth checking your date and time settings. Incorrect system time can lead to security certificate errors, causing browsers to block access to websites, marking the connection as insecure.
⚠️ Please note: Router interfaces are constantly being updated. Menu item names may differ from those described in the instructions. Always consult the latest documentation from the manufacturer of your model.
For a comprehensive assessment of your channel's throughput, use speed measurement services such as Speedtest.net or Fast.comIt's important to test both a device connected via cable and via WiFi to understand the actual speed loss on the wireless side.
When testing, make sure other devices aren't currently downloading large amounts of data. Background game updates or torrent downloads can skew test results.
Compare the resulting figures with those stated in your data plan. If the cable speed matches your plan's plan, but the WiFi speed is significantly lower, the problem lies with the router's radio module or the receiving device.
There are a number of specific issues that can masquerade as a general network problem. For example, an IP address conflict occurs when two devices on the network are assigned the same address. This leads to intermittent connection interruptions.
Another possible cause could be outdated router firmware. Manufacturers regularly release updates that fix security bugs and improve stability. radio module.
Check the list of connected devices in the router's admin panel. Unknown users may indicate a network hack, which can also lead to slower speeds and unstable operation.
Why is WiFi slow even though the router is new?
Speed may be limited by the older Wi-Fi standard on the receiving device (e.g., a smartphone), power-saving settings, or physical obstacles. It's also worth checking whether the 802.11b/g-only mode is enabled, instead of mixed or ac/ax.
How often should I reboot my router?
It's recommended to perform a preventative reboot every 1-2 weeks. This allows you to clear the cache and clear any software errors that have accumulated over time.
Does weather affect WiFi performance?
Heavy rain, thunderstorms, or fog can weaken the signal, especially if you use external antennas or live in a private home with overhead power. Inside an apartment, the weather's impact is minimal, but humidity can slightly alter the dielectric constant of the walls.
What to do if even resetting the settings doesn’t help?
If a factory reset and reconfiguration fail, there's a high probability of a hardware fault in the router (e.g., a faulty WiFi module or power supply). In this case, the hardware will need to be replaced.