Figure 35 Ethereal in Action
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Sniffing requires that the packets somehow be sent to the attacker. If the attacker is local and in a shared media environment (Ethernet hub, wireless), all the attacker must do is place his network interface card (NIC) in promiscuous mode. If instead the media is switched, some kind of Media Access Control (MAC) flooding or traffic redirection must occur. If the attacker is remote, traffic redirection is the attacker's only option.
Continue reading here: Network Manipulation
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