WinPcap, a free Windows port of the UNIX libpcap
packet-capture library, is also necessary to run Nmap, WinDump, and Snort on
the Windows platform. Nmap is a great free port scanner, and WinDump is the
Windows version of tcpdump, a command-line protocol analyzer similar to
Tethereal. Snort is a popular open-source Intrusion Detection System (IDS). You
can download Nmap from
