Description:

ettercap is a network sniffer/interceptor/logger for ethernet LANs
(both switched or not). It supports active and passive dissection of
many protocols (even ciphered ones, like SSH and HTTPS). Data
injection in an established connection and filtering (substitute or
drop a packet) on the fly is also possible, keeping the connection
synchronized. Many sniffing modes were implemented to give you a
powerful and complete sniffing suite. Plugins are supported. It has
the ability to check whether you are in a switched LAN or not, and to
use OS fingerprints (active or passive) to let you know the geometry
of the LAN. The passive scan of the LAN retrieves infos about: hosts
in the lan, open ports, services version, type of the host (gateway,
router or simple host) and extimated distance in hop.