wireshark: Wireshark wireshark: wireshark: Wireshark (formerly Ethereal) is a network traffic analyzer, or wireshark: "sniffer", for Unix and Unix-like operating systems. It uses GTK+, wireshark: a graphical user interface library, and libpcap, a packet capture and wireshark: filtering library. wireshark: wireshark: wireshark: wireshark: wireshark: