The Wireshark Capture Filter window will appear where you can set various filters. To start the packet capturing process, click the Capture menu and choose Start. Wireshark will continue capturing and displaying packets until the capture buffer fills up. The buffer is 1 Mbytes by default. This size is generally good enough, but to change it click the Capture menu, choose Options, and adjust the Buffer size value accordingly.
Alternatively, you can set the capture run length in packets or minutes , and the capture will automatically stop when that length has been met. The packet capture will display the details of each packet as they were transmitted over the wireless LAN.
Figure 1 is a screenshot of a sample packet capture window. You can select a specific packet to display more details. The one selected in Figure 1, packet 3, is an The middle panel displays information about this packet, and you can choose a specific field of the packet such as Duration field shown in the figure , and the contents of that field are displayed in hex and ASCII format in the bottom panel. When troubleshooting a wireless LAN, use Wireshark to capture the packets, and analyze the flow of packets to see if you can spot the problem.
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Wireless network sniffing is akin to wiretapping a phone line, only without the court order that legalizes the activity. There are valid and legal uses for a wireless sniffer tool to be used. An example is where a network administrator makes use of one to secure or monitor their network. Home users may employ a sniffer to better understand how their network operates. Unfortunately, a prime reason that WiFi sniffers are used by unscrupulous individuals is to attempt to collect information from, or gain access to, an unsecured network.
A wireless sniffer allows someone to attack your network from a distance, making it hard to determine if there are attempts to compromise your data. WiFi sniffers come in two flavors: hardware and software. They perform the same tasks, though the software route may be more popular in most cases. You can obtain software WiFi sniffers for Windows, Mac, and mobile operating systems.
In the case of a mobile device, you are in essence turning it into a hardware sniffer when using it with a sniffing application. It does not take any special level of technical expertise to operate a hardware WiFi sniffer. Most devices are small and portable, able to easily fit in your pocket or laptop bag. You point the device in the direction where you believe a wireless network can be detected. You will be alerted by display lights when a wireless network is found within range of your device.
A WiFi sniffer for Android devices uses add-on tools and will offer a similar display when searching for networks. Quality hardware sniffers will be able to detect a wireless signal in spite of interference from Bluetooth devices, microwaves or cell phones.
There are many different software applications that serve the purpose of WiFi sniffing. You can download these tools for just about any operating system. Some of these tools have advanced features that allow you to do more than just locate the nearest wireless network.
Users can download tools such as aircrack-ng or Zanti to perform WiFi sniffing on an Android device. There are many applications that enable WiFi sniffing on a Mac as well.
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