Expert system usage

In this section, we'll take a look at the expert system in Wireshark, which is a great feature that not many people know about, and it allows you to easily find problems in a packet capture.

You can follow along with the capture that I'll use by downloading the same one off of the Wireshark website. There's a great section of their wiki called SampleCaptures that allows you to download captures that have been submitted by the community:

What we'll do is search for errors, and the first one that comes up is cmp-in-http-with-errors-in-cmp-protocol.pcap.gz. If you download that and extract it, you can open up the pcap file and follow along:

Here, we have our pcap file from the wiki, and there are two ways to get to the expert system. The first way is from the Analyze menu. We click on Analyze, and go to Expert Information:

The second method is in the bottom left. As you can see in the following screenshot, it is a yellow colored icon:

This icon color will change based on the...