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AirPcap User’s Guide 17
Figure 7: Wireless Settings Dialog in Wireshark
The parameters that can be configured are:
• Channel: the channels are specified in terms of their center
frequencies and the range of channels varies from adapter to adapter.
• Channel Offset: set to -1, 0, or +1 for AirPcap N. This allows the use
of “wide” channels.
• Capture Type: 802.11 frames only, or 802.11 frames plus Radio
information (Radiotap header), or 802.11 frames plus the Per Packet
Information (PPI) header. Radiotap and PPI include information such
as, transmit rate, signal power, signal quality, channel, and will be
displayed by Wireshark in the radiotap header of every frame.
• Include 802.11 FCS in Frames: if checked the captured frames will
include the 802.11 4-bytes Frame Check Sequence.
• FCS Filter: this drop-down list allows to configure the kind of Frame
Check Sequence filtering that the selected adapter will perform:
o All Frames: the adapter will capture all the frames,
regardless of whether the FCS is valid or invalid.
o Valid Frames: the adapter will only capture frames that
have a valid FCS.
o Invalid Frames: the adapter will only capture frames that
have an invalid FCS.