Chapter 4. API Guides
c) Select the Interface to Start Packet Capture
As the red markup shows in the picture above, many interfaces are available. The first one is a local NIC and the
second one is a wireless NIC.
Please select the NIC according to your requirements. This document will use the wireless NIC to demonstrate packet
capture.
Double click wlan0 to start packet capture.
d) Set up Filters
Since all packets in the channel will be captured, and many of them are not needed, you have to set up filters to get
the packets that you need.
Please find the picture below with the red markup, indicating where the filters should be set up.
Fig. 50: Setting up Filters in Wireshark
Click Filter, the top left blue button in the picture below. The display filter dialogue box will appear.
Fig. 51: Display Filter Dialogue Box
Click the Expression button to bring up the Filter Expression dialogue box and set the filter according to your require-
ments.
The quickest way: enter the filters directly in the toolbar.
Click on this area to enter or modify the filters. If you enter a wrong or unfinished filter, the built-in syntax check
turns the background red. As soon as the correct expression is entered, the background becomes green.
The previously entered filters are automatically saved. You can access them anytime by opening the drop down list.
For example, as shown in the picture below, enter two MAC addresses as the filters and click Apply (the blue arrow).
In this case, only the packet data transmitted between these two MAC addresses will be captured.
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