How to Check Wi-Fi Requests: Analyze Traffic and Devices

Monitoring incoming and outgoing requests over a wireless network is a fundamental skill for any system administrator or advanced user looking to secure their network. Many router owners are unaware that their home network could be exposed to prying eyes, with background application processes constantly sending data to the outside world. Understanding how packets are formed and transmitted allows one to identify leaks of confidential information or detect miners hidden in smart devices.

There are several levels of monitoring: from simply viewing a list of connected clients in the router interface to deep packet sniffing using specialized software. Traffic analysis It helps not only with security but also optimizes internet speed by identifying data-hungry apps. In this article, we'll explore tools and methods that will give you complete control over the digital space of your home or office.

It's worth noting that modern encryption protocols, such as WPA3, significantly complicate data interception, making it impossible to read packet contents without the decryption key. However, metadata, such as destination IP addresses and the amount of information being transmitted, remains visible. Wireshark and built-in router loggers are your main allies in this process.

Analyzing connected devices via the router interface

The very first and most accessible step for any user is to check the list of clients connected to the access point. Almost any modern router, whether Keenetic, Mikrotik or TP-Link, has a built-in monitoring feature for active connections. It displays MAC addresses, IP addresses, and often device names, allowing you to quickly identify uninvited guests. If you see a device with the name "Unknown" or a MAC address, this is a reason for immediate investigation.

To access this data, you need to log in to the administrator's web interface. This is usually done by entering the gateway address (often 192.168.0.1 or 192.168.1.1) in the browser's address bar. After logging in, look for sections with names like "Client List," "DHCP Server," "Status," or "Wireless Statistics." On some models, for example, Asus with firmware Asuswrt, you can see not only current connections, but also traffic history for each device.

⚠️ Note: Router interfaces are constantly being updated. Menu locations may differ from those described, so please consult the official documentation for your model or look for sections related to "Client List" or "Attached Devices."

MAC addresses deserve special attention. This is a unique identifier for a network interface, difficult for an ordinary user to forge on the fly. By comparing the MAC addresses listed on the router with the labels on your devices, you can accurately determine the makeup of your network. If there's a device in the list that you can't identify, try disabling Wi-Fi on your devices one by one and watch the entries disappear from the list.

Using packet sniffers for deep analysis

When the router's built-in tools are not enough, professional traffic analyzers, known as sniffers, come into play. Wireshark — is the industry gold standard for capturing and examining every byte passing through a network interface. Working with Wi-Fi traffic at the packet level requires the network card to support Monitor Mode, which is not available on all adapters.

The analysis process begins with selecting the correct interface. In Wireshark, this can be your physical Wi-Fi adapter or a virtual interface created for capturing. Once the capture starts (Capture) the program will start outputting a real-time data stream. Filtering is a key skill here. Instead of drowning in thousands of rows, use filters, for example wlan.addr == aa:bb:cc:dd:ee:ff to track a specific device or http.request to search for HTTP requests.

tshark -i wlan0 -f"port 80 or port 443" -w capture.pcap

It's important to understand the difference between clear and encrypted traffic. If the network uses WPA2 encryption, without first capturing the 4-way handshake and then brute-forcing the password, you'll only see encrypted noise. However, even without decrypting packets, you can analyze the headers and traffic volume. This allows you to determine whether a video stream is running (constant high traffic) or whether text messages are being exchanged (short packets with intervals).

Is it possible to decrypt HTTPS traffic?

Yes, but only if you install a root certificate on the client device or use the MITM (Man-in-the-Middle) method with certificate substitution, which requires advanced knowledge and is used for debugging applications, not for spying.

Mobile apps for network testing on Android and iOS

For quick checks without connecting a laptop, there are powerful mobile apps. On the platform Android The possibilities are wider thanks to the openness of the system: applications like Fing, Network Analyzer or Wifi Analyzer allow you to scan the network, identify open ports, and see which domains your device is requesting. iOS The functionality is limited by Apple's security policies, but basic analysis is available through Network Analyzer Lite or Linksys.

Application FingFor example, it doesn't just display a list of devices but also attempts to identify their type (camera, printer, phone) and manufacturer by MAC address. More advanced features allow you to run ping tests and traceroute directly from your phone. This is convenient when you need to quickly check whether your phone can see a network printer or NAS storage.

• 📱 Fing — the best tool for general scanning and discovery of devices on the network.
• 🔍 Packet Capture — allows you to intercept traffic from your Android device without root access, creating a local VPN tunnel.
• 📶 WiFi Analyzer - is ideal for analyzing channel congestion and signal levels, which indirectly affects the quality of request transmission.

It is worth noting that in order to intercept traffic others Connecting devices to the network from a mobile phone will require root access and specific configuration, as regular apps only run within the OS sandbox. However, these tools are quite sufficient for diagnosing your own connections.

Command Line: Utilities for Query Diagnostics

For those who prefer the console and precision, operating systems offer powerful built-in tools. Windows, Linux, and macOS all have utilities that allow you to view active connections and statistics without installing additional software. The command netstat (network statistics) displays all active TCP connections, the ports on which the system is listening for connections, and the state of the connections.

In modern Windows systems, the command is more commonly used. Get-NetTCPConnection in PowerShell, which gives more structured output. The command ipconfig /all will show the complete network configuration, including the DNS servers through which name requests are processed. And the utility ping will help check the availability of a remote host and its response time.

Usage arp -a is especially useful for identifying devices your computer has recently communicated with, even if the direct connection is currently down. This allows you to find traces of activity on your local network. In Linux, the equivalent command is ip neigh or arp -n.

Analysis of system logs and router logs

Routers and operating systems keep detailed event logs, which are often ignored by users. These logs contain information about connection attempts, authorization errors, DHCP requests, and firewall blocks. To access your router's logs, navigate to the "System Log," "Logs," or "Administration" sections.

Logs often show port scanning attempts from the external network (WAN), indicating a potential bot attack. They also record instances when a new device requests an IP address. If you see frequent requests from the same MAC address with errors, this may indicate a faulty device or a password bruteforce attack.

In the Windows operating system, you can view network events through the "Event Viewer" (eventvwr.msc). Path to network logs: Windows Logs → SystemLook for events with a source Dhcp-Client or Netwtw (for Intel Wi-Fi drivers). In macOS, networking logs are available via Console (Console), where you can filter messages by the word "wifi" or "airport".

⚠️ Warning: Logs can fill up very quickly. If you're looking for a specific error, enable saving logs to an external server (Syslog) or export them regularly, as temporary entries are often lost when the router is rebooted.

Security: How to protect yourself from request interception

Understanding how requests are verified brings us to the issue of security. If you can see your traffic, then, theoretically, so can an attacker within range or with access to your equipment. The first step should always be to use strong encryption. WEP and WPA (TKIP) protocols are considered obsolete and hackable; use only WPA2-AES or WPA3.

The second important aspect is network segmentation. The Guest Network should always be enabled for visitor devices and IoT gadgets (smart light bulbs, kettles), which are often vulnerable. This isolates them from your main computers and files. It's also recommended to disable WPS, as this protocol has known vulnerabilities that can allow Wi-Fi password recovery.

Regularly changing passwords and updating router firmware closes holes that can lead to data leaks. Firmware contains security patches that fix vulnerabilities discovered by researchers. Ignoring updates leaves your network open to known exploits.

Frequently Asked Questions (FAQ)

Can my ISP see my Wi-Fi requests?

Yes, your ISP sees all traffic leaving your network and going online. However, if HTTPS is used (which is now the standard), it only sees website domains, not page content or passwords. Wi-Fi encryption (WPA2) only protects the section between your device and the router.

How do I find out who is stealing my Wi-Fi?

The most reliable way is to log into your router's admin panel and view the list of connected clients (DHCP Client List). Compare the number of devices and their MAC addresses with those in your home. Unknown devices will reveal the identity of the thieves.

Is it safe to use public Wi-Fi for banking?

No, it's risky. Public networks can be vulnerable to data interception (MITM attacks). If necessary, use mobile internet or a VPN with strong encryption before accessing your banking app.

Does checking traffic slow down internet speed?

Passive monitoring (viewing logs or client lists) doesn't affect speed. However, active sniffing (capturing packets) or port scanning can put additional strain on the router's processor and communication channel, causing lag.