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 sincronized. 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 retrives
infos about: hosts in the lan, open ports, services version,
type of the host (gateway, router or simple host) and
extimated distance in hop.