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Wireshark Demo

wireshark-demo-qr.png

(Usage hints for this presentation)

Summer Term 2020
Dr. Jens Lechtenbörger (License Information)

DBIS Group
Prof. Dr. Gottfried Vossen
Chair for Computer Science
Dept. of Information Systems
WWU Münster, Germany

1 Background

internet-qr.png I suppose that you know basics about the Internet, for example, as covered in my OER presentation Introduction to the Internet, to which I refer subsequently.

2 Wireshark Demo

2.1 Wireshark Filters

  • Capture filter
    • Specify among Capture → Options, restrict what is being captured
      • Three qualifiers: type (host, net, port), dir (src, dst), proto (ip, tcp, udp, arp, …)
        • port 53: Source or destination port is 53
        • host www.uni-muenster.de: Source or destination host has given name; also IP address instead of name possible
      • Boolean combinations with and, or, not, …
        • dst host 128.176.0.12 and udp dst port 53
  • Display filter
    • Restrict what is being displayed in filter bar below icons
      • E.g., dns, arp, ip.addr==<some IP address>
      • Alternatively, use decoded piece of protocol information
        • E.g., TCP layer, Flags, right click → “Apply as Filter”

2.2 Warning

  • Inspecting other people’s network traffic is illegal
    • Invasion of privacy, maybe worse
  • Network cards can work in so-called promiscuous mode
    • Then, they accept all frames, regardless of destination address
    • Thus, turn promiscuous mode off
      • Unless you acquired consent of all affected parties

3 Live Demo

License Information

This document is used to teach basics of distributed systems. Source code and source files are available on GitLab under free licenses.

Except where otherwise noted, the work “Wireshark Demo”, © 2018-2020 Jens Lechtenbörger, is published under the Creative Commons license CC BY-SA 4.0.

No warranties are given. The license may not give you all of the permissions necessary for your intended use.

In particular, trademark rights are not licensed under this license. Thus, rights concerning third party logos (e.g., on the title slide) and other (trade-) marks (e.g., “Creative Commons” itself) remain with their respective holders.