Wireshark is a network protocol analyzer, which lets you see what’s happening on your network at a microscopic level. It can be used to examine security problems, troubleshoot network issues, verify network applications, and debug protocol implementations. Wireshark can read & write many different capture file formats including tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer (compressed and uncompressed), Sniffer Pro, and NetXray.
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