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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.高易点点头，说道：大王，那徐家小姐，您可曾见到过？尹旭点头道：可是那个红衣女子？刁蛮嚣张的紧啦。她叮嘱红椒认真听这《女诫》，又问她其他。　　金大义态度恶劣，任性，几次粗暴地将大嫂端给他的饭打翻。当村中的刘文书告诉大嫂他是回民时，大嫂原谅了他。由于伤口感染，金大义一连数日处于高烧昏迷当中，大嫂不分昼夜地守护一旁。大嫂的善良举动，使金大义滋生了一丝安全感，情绪逐渐稳定。过年了，婆姨们盼望男人归来，　　作为一名优秀的FBI女刑警，丽娜·斯科特(安吉丽娜·茱莉 饰)不仅聪明性感身怀功夫，不喜欢用传统的方法破案，而且擅长分析罪犯的神秘心理，来拨开凶杀的迷雾找出破案的线索。她对犯罪分子的直觉，常常能察觉到他们微妙的杀人心理，最终成功地破获案件，把关于此案的文件送进档案柜。很多时候猜疑比打击更为可怕。