Most of the details are in the video, but here’s the summary of some common commands This is a simple netsh command to start and stop a capture. Even the ‘portable’ version of Wireshark isn’t entirely portable, and you may run into challenges trying to run it.Īfter some research, and testing, I’ve decided to use Microsoft’s built in packet capture commands and no, I’m not referring to Network Monitor. Each option has its own pros and cons that you need to determine on the fly for each scenario. Then I go down the rabbit hole of options: SPAN, hub, TAP, etc. I wanted to capture packets from someone’s Windows computer, and I couldn’t install Wireshark for a variety of reasons. Tip: you can always use filter in Wireshark to just display the packets you want to see.I’ve been there before. You should use your own screenshot.ĭo you see any parallel connections your browser makes? If so, how many can you see in your screenshot? Again, use Wireshark to capture the traffic while you open up the page.Įxample screenshot below. Now, we will open a webpage with embeded objects (e.g., cnn.com which has a lot of images/videos embeded) in a browser. Example screenshot below.ĭescribe the TCP packets that you see, i.e., how each packet corresponds to TCP handshake, data transfer and closing connection steps. After the curl/wget is done, stop the capture in Wireshark. Warning: keep your other network activities to the minimum for a better experience, e.g., avoid streaming Netflix when capturing in Wireshark. Then you should be able to see packets flowing! Click the red square button on top to stop the capture. On the left side, select one (or more) interfaces that you want to capture from, then click “Start”. If you run into any problems, you can refer to for more detailed help. On Mac and Linux, you can also install from command line (homebrew/macports, yum install, apt-get install). You can find installation instructions here: We will use Wireshark, a network packet capture tool, to look at TCP packets when grabbing a webpage.
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