Live data can be read from Ethernet, IEEE 802. Capture files compressed with gzip can be decompressed on the fly. Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, NetScreen snoop, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others. The most powerful display filters in the industry. Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility. Multi-platform: Runs on Windows, Linux, macOS, Solaris, FreeBSD, NetBSD, and many others. Deep inspection of hundreds of protocols, with more being added all the time. 
Wireshark has a rich feature set which includes the following: Wireshark is available for free, is open source, and is one of the best packet analyzers available today.
However, with the advent of Wireshark, that has changed. In the past, such tools were either very expensive, proprietary, or both.
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