When DDoS attack packets are transmitted from the attacker to the victim's server, the attack packets are detected in the edge router of the LAN accommodating the server. These packets are then destroyed, the address of the upstream routers close to the attack source are retrieved, and attack source...http://www.google.com.hk/patents/US20020032854?utm_source=gb-gplus-share專利 US20020032854 - Distributed denial of service attack defense method and device
