SAINTCON 2023 - Kyle Feuz - Wireshark 101

Understand your network traffic with a comprehensive introduction to Wireshark, covering capture and display filters, colorization rules, statistics, and more.

Key takeaways
  • The importance of understanding what normal looks like on your network to identify anomalies.
  • Filtering in Wireshark can be done on any field and protocol.
  • Capture filters are different from display filters, with capture filters being used during capture and display filters being used during analysis.
  • Colorization rules can be used to highlight specific traffic and make analysis easier.
  • Statistics can be used to get an overview of a capture file, such as the number of packets and conversations.
  • Wireshark has multiple tabs for different levels of analysis, including protocol, TCP, and UDP.
  • Capture files can be loaded into Wireshark to analyze network traffic.
  • Pre-shared master secrets can be saved to a file and used to decrypt traffic.
  • Wireshark has a builder/wizard tool to help create complex filters.
  • Coloring rules can be customized to highlight specific traffic.
  • Display filters can be used to limit what is shown in the packet list.
  • Capture filters can be used to capture specific traffic and limit what is captured.
  • Wireshark has multiple interfaces that can be used to capture traffic, including Ethernet, Wi-Fi, and more.
  • It is important to understand the different stages of networking, including layer 2, 3, and 4.
  • Wireshark has a statistics feature that can be used to get an overview of a capture file.
  • WiFi signals can be picked up and viewed using Wireshark.
  • SSL key log files can be used to decrypt traffic.
  • Wireshark can be used to analyze network traffic and identify issues.
  • Filters can be saved as bookmarks for easy recall.
  • Wireshark has a “selected” feature that allows filters to be referenced and used in other parts of the application.