Dissecting network traffic
Wireshark [1], the packet sniffer formerly known as Ethereal, is a must-have for system administrators. If you've ever had to troubleshoot a network problem or needed to watch a transaction with a server, then this is the tool for you. Like most (all?) network data capture programs for Linux, Wireshark relies on libpcap, which provides a system-independent interface for capturing packets; therefore, you do not need to write custom routines for every packet sniffer (tcpdump, Snort, Wireshark, etc.). As long as your OS (e.g., Linux, *BSD, HP-UX, Solaris, Windows, etc.) and software support libpcap, you can sniff packets to your heart's content.
Installing libpcap and Wireshark
Libpcap comes with most operating systems, and Wireshark is almost always included (at least on Linux and BSD). Wireshark is sometimes split into two separate packages: one consisting of the back-end utilities like tshark and mergecap, and the other consisting of the graphical user interface (GUI). On Fedora and most related systems, you can simply run yum:
yum install libpcap yum install wireshark-gnome
[...]
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