Wireshark (aka Ethereal) is a network protocol analyzer allows you to capture and examine data from a live network or from a snapshot file on disk.You can browse the captured data in an interactive way and view summary information and details for each package. Wireshark has several powerful features, including a language filter rich display and ability to view flow created back of the TCP.
The program can read the capture file from tcpdump (libpcap), NAI Sniffer (compressed and uncompressed), Sniffer Pro, NetXray, snoop, Shomiti Surveyor, AIX s iptrace, Microsoft Network Monitor, Novell s LANalyzer, RADCOM s WAN / LAN Analyzer, HP-UX nettl, ISDN4BSD, iplog security IDS of Cisco, diary pppd (format pppdump) and group AG / Wildpacket Etherpeek.Wireshark can also read traces made from router WAN Lucent / Ascend router and ISDN of Toshiba. Any files in this number can be compressed with gzip and Wireshark will decompress them quickly.
Content update Wireshark 3.0.4: