Ettercap NG is a network sniffer/interceptor/logger for switched LANs. It uses ARP poisoning and the man-in-the-middle technique to sniff all the connections between two hosts. Features character injection in an established connection - you can inject characters to server (emulating commands) or to client (emulating replies) while maintaining an established TCP connection! Integrated into a easy-to-use and powerful ncurses interface. Screenshots here. RPM available here. Tested on Linux, FreeBSD, OpenBSD, NetBSD 1.5, Mac OS X, Windows NT/2000/XP, and Solaris 2.x.
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