Wireshark is Free, Open-source Network Protocol Analyzer. You Can Easily Captures All Network Traffic. Wireshark Project Started by Gerald Combs in 1998.
Features:
✔️Deep inspection of hundreds of protocols, with more being added all the time
✔️Provides Live capture and offline analysis
✔️Standard three-pane packet browser
✔️Runs on all Multi-platform like Windows, Linux, macOS, Solaris, FreeBSD, NetBSD, and many others
✔️Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility
✔️Most Powerful display filters
✔️Rich VoIP analysis
✔️Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Network General Sniffer® (compressed and uncompressed), Microsoft Network Monitor, Sniffer® Pro, and NetXray®, Network Instruments Observer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, NetScreen snoop, Novell LANalyzer, and many others
✔️Read Live data from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platform)
✔️Decryption support for many protocols, including IPsec, SNMPv3, SSL/TLS, ISAKMP, Kerberos, WEP, and WPA/WPA2
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