To edit the display filter, go to the Analyze menu, and then select Display Filters…, which will bring up the following dialog box: Figure 7.7 – Display Filters dialog box Editing display filtersĪfter working with the display filters, you may need to change an IP address, port number, or make some other change. The following section illustrates how you can edit the display filters to customize your workflow. Wireshark’s display filters can easily be modified. For example, if you want to see TCP or ARP traffic, then you would use the tcp || arp display filter. You can create a simple filter on any of the protocols Wireshark supports by using a single protocol or adding a logical operator. Within the toolbar is the text Apply a display filter…, where you can easily apply and edit display filters, as shown here: Figure 7.6 – Wireshark startup screen
Across the top, below the icons, is the filter toolbar. When you launch Wireshark, you will see the startup screen. It’s not uncommon to have a capture with over 3,000 packets containing many different types of traffic. While capturing traffic, or analyzing a pre-captured file, display filters help to narrow the scope and home in on specific types of traffic. Download a PDF of Chapter 7 to also learn how to create capture filters, filter network traffic, use shortcuts and more.Ĭheck out an interview with Bock, where she elaborates on Wireshark use cases and how to use Wireshark profiles. In the following excerpt from Chapter 7 of her book, “Using Display and Capture Filters,” Bock explains about how to create, edit and use display filters.
Wireshark display filters help narrow the scope of traffic analysis during packet filtering, said Lisa Bock, author of Learn Wireshark: A definitive guide to expertly analyzing protocols and troubleshooting networks using Wireshark, Second Edition. One such feature to figure out before testing is display filters. But, before jumping into this versatile tool, it is important to understand its features. The open source Wireshark tool enables users to analyze network traffic at the micro level, sniff network packets, troubleshoot network issues and more.
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