After your browser has displayed the INTRO-wireshark-file1.html page (it is a
simple one line of congratulations), stop Wireshark packet capture by selecting
stop in the Wireshark capture window. The main Wireshark window should now
look similar to Figure 3. You now have live packet data that contains all protocol
messages exchanged between your computer and other network entities! The
HTTP message exchanges with the gaia.cs.umass.edu web server should appear
somewhere in the listing of packets captured. But there will be many other types
of packets displayed as well (see, e.g., the many different protocol types shown in
the Protocol column in Figure 3). Even though the only action you took was to
download a web page, there were evidently many other protocols running on your
computer that are unseen by the user. We’ll learn much more about these
protocols as we progress through the text! For now, you should just be aware that
there is often much more going on than “meet’s the eye”!