(Dsniff is a high-end password sniffer, and the Dsniff tool written by DugSong is one of the first monitoring tools to extend the traditional sniffer concept. Dsniff injects crafted packets into the network and redirects the communication data from the beginning to the attacker's machine. Under this method, Dsniff allows the attacker to eavesdrop on the data in the network of the exchange environment, and even if the attacker and the attack scheme are not in the same LAN (local area network), the attacker can collect the data he wants. It supports telnet, ftp, smtp, pop, imap, http, and some other protocols. If you only want to get the password and username of the user's host, please choose dsniff.)