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These attacks usually use server resources rather than bandwidth from the server. They can also use the resources of network devices (such as firewalls, intrusion detection systems, and switches) on the periphery of the server. Examples include Smurf attacks (ICMP using broadcast IP spoofed IP), Fraggle attacks (same as Smurf, using UDP only), SYN flooding, dead pings (super large ICMP with the same destination and source IP and port), and many others.After opening the outer package, eh, it looks like an egg package!　　挑釁的活動，擴大了美高梅電視台獨家節目的範圍 吸引全世界的觀眾。」本剧是围绕男女之间是否有真正的友谊，在各个人物的角度和立场上讲述了各自的观点。内容有反转魅力，接近现实，引起了大多数人的共鸣。住在阿佐谷小区的小学4年级学生泽渡悠真，对即将接近地球的“SHⅢ·厄尔维尔彗星”着迷。去了江东，安全倒是没什么问题。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.