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　　故事改编自真人真事。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.　　《邪恶力量》（Supernatural）由美国WB电视台制作，讲述灵异超自然现象大多来自于美国的都市传说和民间传说。Then we must have written the following code before:《佛本是道》已经连载了三十来万字，算上他的存稿，那就是四十多万字，庞大的世界观慢慢露出冰山一角，其中最重要的一个设定巫的设定也开始揭开出来。一时间，小葱又喊惊跑了她的鱼，本来安静的船上闹嚷起来。