How It Works: Captures Wireless Taffic on a Single Channel
Each AirPcap adapter captures traffic on a single channel at a time; the channel setting for the AirPcap adapter can be changed using the AirPcap Control Panel, or from the “Advanced Wireless Settings” dialog in Wireshark or other tools. Depending on the model of your AirPcap adapter, it can be set to any valid 802.11a/b/g/n channel for packet capture.
Operate in completely passive mode
AirPcap adapters operate in a completely passive mode. This means that they capture the traffic on a channel without associating with an access point or interacting with any other wireless device. Unless you are transmitting with either AirPcap Tx , Ex or Nx, the adapters are not detectable by any other wireless station.
Can also work in monitor mode
The AirPcap adapters can work in Monitor Mode. In this mode, the AirPcap adapter will capture all of the frames that are transferred on a channel, not just frames that are addressed to it. This includes data frames, control frames and management frames.
Can be configured to decrypt WEP-encrypted frames
The AirPcap software can optionally be configured to decrypt WEP-encrypted frames. An arbitrary number of keys can be configured in the driver at the same time, so that the driver can decrypt the traffic of more than one access point at the same time. WPA and WPA2 support is handled by applications such as Wireshark and Aircrack-ng.
Use multiple AirPcap adapters for multi-channel aggregation
When more than one AirPcap adapter is plugged in, the AirPcap Control Panel will show one additional interface: the Multi-Channel Aggregator. The Multi-Channel Aggregator is a virtual capture interface that can be used from Wireshark or any other supported application. Using this capture interface, the application will receive the traffic from all installed USB AirPcap adapters as if it was coming from a single device.
The Multi-Channel Aggregator has its own FCS, Capture Type and FCS Filter settings. These settings, and not those of the physical adapter, will be used when capturing from the Aggregator. Note that it’s not possible to set the channel of the Multi-Channel Aggregator; instead, the channel drop-down box will show a list of aggregated channels. To change the channel of any individual adapter, select the Capture adapter from the Interface drop-down list and set the desired value in the channel drop-down box.
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