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Wireshark: The World's Most Popular Network Protocol Analyzer
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Wireshark's powerful features make it the tool of choice for network troubleshooting, protocol development, and education worldwide.
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ntop - network top
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ntop is a network traffic probe that shows the network usage, similar to what the popular top Unix command does. ntop is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform and on Win32 as well.