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Tcpdump: The Basics — Packet Capture, Filtering Expressions, and Hex Diagnostics
Introduction
Welcome to my walkthrough for the TryHackMe room Tcpdump: The Basics!
In my previous article, Wireshark: The Basics, we explored graphical packet inspection, column customization, and payload carving. While GUI tools excel at visual analysis, command-line utilities remain essential for lightweight environments, headless servers, and rapid packet capture.
In this room, we examine the core capabilities of tcpdump. Built upon the foundational libpcap library, tcpdump allows network analysts and security specialists to capture, filter, and inspect raw packet data directly from the terminal with exceptional speed and low resource overhead.
If you missed the previous entry in this series, you can catch up on my walkthrough for Wireshark: The Basics below.
What we will cover
- Core Concepts & CLI Flags: Understanding essential flags for interface selection, packet counts, and output suppression.
- Capture File Operations: Writing raw packets to
.pcapfiles for offline…
