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Network monitoring and security
n Ethereal and tethereal – a feature rich protocol analyzer (now called Wireshark, see below)
n John the Ripper – password cracking software
n Nessus – a comprehensive open-source network vulnerability scanning program
n Netstat – displays a list of the active network connections the computer
n Nmap – free port scanning software
n SAINT – System Administrator’s Integrated Network Tool – Network Vulnerability Scanner.
n SATAN – the Security Administrator Tool for Analyzing Networks – a testing and reporting tool that collects information about networked hosts
n Snoop – Solaris packet sniffer
n Snort – an open source network intrusion detection system
n tcpdump – a computer network debugging tool that intercepts and displays TCP/IP packets being transmitted or received
n Wireshark – a protocol analyzer, or "packet sniffer", similar to tcpdump, that adds a GUI frontend, and more sorting and filtering options (formerly named Ethereal)
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