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III. SYN Attack Tool有了。可是，山外却闹了起来We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, What makes these packets special is that, The destination IP address points to the server, router, and other facilities that act as reflectors, while the source IP address is forged as the target IP address, When the reflector receives the data packet, it will think whether the data packet is requested by the attack target, so it will send the corresponding data to the attack target. When a large number of response data packets flock to the attack target, it will deplete the network broadband resources of the target, resulting in denial of service attacks.At the moment, let's do an experiment.洛杉矶接连发生9起绑架案，被绑架者来自各行各业，有神父、检察官、演员还有俱乐部老板，彼此间似乎没有任何关联，而绑架案却都由一人所为，一个戴着蓝色面具、一身黑衣的男子。此案惊动洛城，警方全员出动，却始终找不到任何头绪。与此同时，在城市某各个角落黑暗潮湿的地下室内，9个被绑架者迎来了人生中最为痛苦难熬的时刻。蒙面人要求他们思考被绑架的原因，然后每个10分钟便杀掉一人，直到他们找到原因为止。人质们激烈争论，相互攻讦，抑或检讨人生中所犯下的错误。时间一分一秒地流逝，死神的判决越来越近