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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.第二次世界大战前夕，一名普通的陆军士兵（龟梨和也 饰）因帮助同伴而殴打长官，随后被军事法庭判处死刑。关键时刻，名叫结城（伊势谷友介 饰）的神秘男子突然出现，并将之吸纳进专门培养间谍的秘密部门——D机关。历经层层考验，青年终于得到第一项任务。不久前某犹太科学家遭到暗杀，而他记载着最新式武器设计图的黑色笔记据说落入美国大使埃内斯特·格雷厄姆（Richard Moss 饰）手中。青年化名嘉藤次郎来到了被称为魔都的城市，伺机盗出笔记。与此同时，英、苏、德等国的特工也闻风而动，顶峰的间谍大战即将展开……何老将军向来嫉恶如仇、凶狠霸道，刚按捺下去的怒火噌地又升起，寒声问道：怎么？黎章小儿，可是对老夫处置不满？魏铜、钱明等人紧张极了，只有黎水，定定地望着黎章：师姐一定会没事的，她不像自己，她向来行事有分寸。他在偏殿等了好一会，板栗才匆匆出来。起初，这样的模式顺风顺水，大家都方便。张爷爷和张叔都不在家，板栗哥哥也不在家，你们去了也没人陪你们。3.1 install ROPgadget