Injection of client-side attacks with Ettercap
Ettercap is a multipurpose sniffer/interceptor/logger for switched LAN, which makes injection of client-side attacks scarily easy. Ettercap launches a man-in-the-middle attack via arp poisoning or port stealing.
Arp poisoning is a technique that modifies the MAC address/IP mapping. As a result, any packets bound for a specific IP will not be routed to the legitimate machine, but rather the attackers machine as it sent a fake ARP package to create an incorrect mapping.
At Christian Seifert's blog.
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