Best Free Network Monitor & Sniffer/Analyzer
SoftPerfect Network Scanner :-
multi-threaded IP, NetBIOS and SNMP scanner with a modern interface and several advanced features. It is intended for both system administrators and general users who are interested in computer security. The program pings computers, scans for listening TCP ports and displays which types of resources are shared on the network (including system and hidden).
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Network protocol analyzer
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