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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.杭州歌舞升平，苏松血流成河。一个纯粹的穿越者，应该是像项少龙同学那样，默默贡献，无私付出，不图名，不图利，即使后世史书上没有记载他，即使天下人都遗忘了他，他依然坚持自己穿越者的责任，为历史正确发展，鞠躬尽瘁，死而后已。　　Return children. Elements ();等静下来，王尚书便宣布今日堂审结束，择日再审。故事聚焦雷纳饰演的捕猎者科里协助奥尔森饰演的FBI探员，调查一宗发生在风河谷的少女谋杀案，但是伴随案件侦破，科里悲惨的过往也被残忍掀开……