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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.这已经是一个奇迹，一个神话。System.out.println ("start the computer! ");杨长帆沉浸在精神黑水的海洋中，拉着沈悯芮向后退了两步，指着书法道，现在看，有没有正在被一万个人强j的感觉。終　日本海海戦按九门解家家规，解家人六十岁生辰那日便是金盆洗手之时。解家老仆庖丁叔六十大寿当天死于非命且死状惨烈。解九爷与受佛爷所托、前来解家贺寿的张副官一同开始追查命案线索，却发现这宗谋杀案的源头要追溯到几年之前。 紧接着，解府仆人以及与谢家有关联的老人接连不断死去，且死亡现场都出现了“虎骨梅花”符印。一个深埋多年的秘密即将被层层揭开… …令尹大人，这不简单是一次的吊祭，于礼节上您绝对该去的。