Sniffing is a data interception technology. Sniffer is a program that monitor or reading all network traffic passing in and out over a network. Telnet, Relogin, FTP, NNTP, SMTP, HTTP, IMAP that all protocol are vulnerable for sniffing because it send data and password in clear text. Sniffing can be use both the ways legally or illegally like for monitor network traffic, network security and for stealing information like password, files from the network. Sniffing can be done both way one is from command line utility and other is from GUI interface. Many network engineers; security professionals and even crackers use these techniques to sniff the network. Sniffing technique also use for ethical hacking. In this article, I will explain you about sniffers and how a sniffer works.
