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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.4. Obtain process instances and tasks according to business keys《新霹雳游侠》他是1982年至1986年在NBC播出的热门剧《霹雳游侠》的续集。 老版中，David Hasselhoff扮演的游侠驾驶着人工智跑车KITT惩恶扬善，让80年代的电视迷记忆深刻，如今游侠的儿子Mike Traceur将带领他的朋友和全新的奈特工业3000号跑车重回荧屏，继续与邪恶作斗争。This is a death experience project called "Waking Up". Each experience is limited to 12 people for about two and a half hours. If Ellie is afraid of "returning to the original road", the game will end directly. She crossed the game hall called "Born Flowers" in the opposite direction and returned directly to "The World".　　被莉可捡到的丧失记忆的机器人雷格，老仆回道：是的，老爷。