In today's world, wireless networks have become critical infrastructure, but their open nature makes them vulnerable to outside surveillance. CommView for WiFi — is a professional monitoring and analysis tool that allows administrators and security experts to thoroughly examine traffic. The ability to intercept packets on the fly provides a unique understanding of what's happening in the air, which devices are active, and what data is being transmitted.
Sniffing on Wi-Fi networks differs significantly from wired monitoring due to the nature of the data transmission medium. You'll need not only software but also compatible hardware capable of operating in monitoring mode. Without proper equipment preparation, any interception attempt will be unsuccessful, as standard network adapters ignore frames not addressed directly to them.
In this article, we'll cover the full process of setting up a traffic interception system, from adapter selection to interpreting the collected data. We'll cover the technical nuances of 802.11 protocols, encryption bypass methods for legitimate testing, and noise filtering techniques to identify specific vulnerabilities. Understanding these processes is essential for building reliable security for a corporate or home network.
Necessary equipment and software
The foundation of any wireless traffic analysis system is the network adapter. Standard built-in Wi-Fi modules in laptops often don't support this mode. Monitor Mode, which is necessary for listening to the entire broadcast, and not just your own communication channel. You will need an external USB adapter based on chipsets from Atheros, Ralink or Realtek, which have open drivers or specialized support in the Windows environment.
The program itself CommView for WiFi It's a paid service, but it offers a trial period sufficient for conducting an audit. It's important to understand that the software sniffer works in conjunction with the adapter driver, which performs low-level frame filtering. If the driver doesn't transmit packets to user space in raw form, the program won't be able to display them, regardless of its capabilities.
⚠️ Warning: Using sniffers on other people's networks without the owner's written permission is a violation of the law. All actions must be performed exclusively as part of testing your own infrastructure or under a contract with the client.
In addition, the operating system must support the installation of specialized drivers. In the environment Windows 10/11 It's often necessary to disable driver subscriptions or use special software versions included with the utility. Driver instability can lead to packet loss, which is critical when analyzing fast-paced handshake processes.
Configuring the adapter and starting monitoring
After installing the software and drivers, the first step is to select the correct network interface. In the main program window, go to the Settings tab and select your wireless adapter from the list of available devices. Make sure the device status is displayed as active and the driver has loaded correctly, with no errors in the system log.
Selecting the scanning channel is key. A Wi-Fi network operates on a specific frequency, and to capture packets from a specific access point, you need to switch the adapter to the corresponding channel. In CommView, this is done through the menu. Settings → Capture → Channels, where you can select a specific channel or the mode of scanning all channels with a delay.
☑️ Preparing for interception
If you don't know the exact channel of the target network, use the built-in spectrum analyzer or the list of available networks to determine it. After selecting the channel, press the button Start Capture (usually a green button or play icon). From this point on, the program begins buffering all frames transmitted over the air, ignoring MAC address filtering.
| Parameter | Description | Recommended value |
|---|---|---|
| Opening hours | Traffic capture type | Monitor Mode (Promoiscuous) |
| Channel | Broadcast frequency | Matches the target AP |
| MAC filter | Selection by addresses | Disabled (for start) |
| Buffer | Memory size | Maximum available |
The process of packet interception and handshake
The most valuable thing when analyzing WPA/WPA2 protected networks is capturing the authentication procedure known as 4-Way HandshakeIt is at this point that the client and access point exchange encryption keys, and intercepting these frames makes it possible to conduct an offline password brute-force attack. CommView automatically marks such packets if they contain the required EAPOL fields.
To successfully intercept a handshake, it's necessary to wait for a new device to connect to the network. If there haven't been any active clients on the network for a long time, security administrators sometimes use deauthentication methods (deauthentication), forcibly disconnecting the legitimate client to force it to reconnect. However, in CommView for WiFi, this feature may be license-restricted or require additional modules.
What are EAPOL packets?
EAPOL (Extensible Authentication Protocol over LAN) are frames used to transmit authentication data. In the context of WPA2, they contain hashes needed to verify a password without transmitting the password in cleartext.
Visually, such packets are often highlighted in color in the program log or have a specific flag in the protocol column. You should pay attention to frames with the type Management and subtype Authentication or AssociationIf the network is active, these packets appear regularly, even without a forced connection break, for example, when the client roams between access points.
⚠️ Note: Security protocols and encryption methods are constantly being improved. WPA3 is already being widely implemented, making classic WPA2 handshake interception less relevant for new networks. Always check the official documentation for the latest methods.
Analysis and filtering of captured traffic
Once a sufficient amount of data has been collected, either in a raw file or in real time, the analysis phase begins. Wi-Fi communications are saturated with service frames (Beacon, Probe Request/Response), which generate significant noise. For effective analysis, filters are essential. In CommView, you can filter by MAC address, IP address, protocol type, or even payload content.
Use the function Filter → Add Filterto filter out unnecessary traffic. For example, if you're only interested in HTTP requests, you can filter packets by port 80. If your goal is DNS analysis, filter by port 53. Properly configured filters can reduce CPU and RAM load and help you find the information you need more quickly in a sea of data.
When analyzing frames, it's important to distinguish between the following frame types: Management, Control, and Data. The primary user information is contained in Data frames. If the network is unencrypted (Open Network), the contents of these frames can be read directly in the window. Hex/Text DumpIn the case of encryption, you will see only an unreadable sequence of bytes.
Decrypting WPA/WPA2 traffic
Intercepted data on a secure network is useless without the decryption key. CommView for WiFi supports on-the-fly traffic decryption if you have the network password (Pre-Shared Key). To do this, add the key to the program settings: Settings → WPA Decryption → Add KeyThe network SSID and password are entered into the appropriate fields.
After adding the key, the program will attempt to decrypt all previously captured and future packets using the algorithm TKIP or CCMP (AES)If the key is correct and the entire handshake was captured, the packet contents will become readable. This allows for inspection of HTTP headers, cookies, and other data transmitted in cleartext within the tunnel.
It is worth noting that modern websites use the protocol HTTPS, which encrypts content at the application layer. Even if you successfully decrypt a Wi-Fi frame, you'll still see encrypted TLS traffic inside. Analyzing HTTPS content requires other methods, such as MITM attacks with certificate substitution, which is beyond the basic functionality of a sniffer.
Common problems and solutions
One common issue is the lack of packet capture despite monitoring mode being enabled. This is often due to another Windows process exclusively using the Wi-Fi adapter. You should close all background applications using the network or temporarily disable the built-in adapter, leaving only the external one for analysis.
Another problem is buffer overflow or packet loss under high channel load. If you see the dropped packets counter increasing, try reducing the system load by disabling complex real-time filters or increasing the capture buffer size in the program settings. Recording directly to the hard drive instead of RAM also helps.
- 🔴 The adapter doesn't see the network: Check whether the chipset supports the frequency range (2.4 GHz or 5 GHz) that the router operates on.
- 🔴 Driver error: Try reinstalling the driver in compatibility mode or as an administrator.
- 🔴 No Handshake: Make sure you are close enough to the client to receive EAPOL packets that may be sent at low power.
Stability also depends on the operating system version. In newer versions of Windows, kernel security mechanisms may block older sniffer drivers. In such cases, running the program in compatibility mode or using a virtual machine with USB device passthrough may be necessary.
Is it possible to intercept packets without a special adapter?
In most cases, no. Standard Windows drivers don't allow you to put the card into monitor mode. However, there are exceptions for some Intel and Atheros models, where experimental drivers can unlock this feature, but stability is not guaranteed.
Is my IP address visible when using CommView?
No, CommView for WiFi operates in passive listening mode. You don't send packets into the network (unless you use injection features), so your IP address doesn't appear in other devices' logs. You're simply "listening" to the radio waves.
Does the program work with the WPA3 protocol?
Currently, WPA3 support is limited. The protocol uses more complex encryption mechanisms (SAE - Simultaneous Authentication of Equals), which make traditional handshake interception for subsequent brute-force attacks extremely difficult or impossible using current methods.