![]() Libpcap comes with most operating systems, and Wireshark is almost always included (at least on Linux and BSD). 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. 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.). 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. Wireshark, the packet sniffer formerly known as Ethereal, is a must-have for system administrators.
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