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穿梭时空，回到过去的历险剧，充满古今对比矛盾的妙趣，一个平凡的80后青年，因缘际会下，回到风云变色的三国时代，认识了刘备、张飞、诸葛亮等等英雄人物，参与了一幕又一幕的历史大事——三英战吕布、三顾草庐、赤壁之战……{}张良这才解释道：和谈的目的有两个，缺一不可，是在救出汉王家人的基础上与争取到最大的利益。静夜中传来一阵狗叫，青木等人又出谷去了。[2]好一会，才似笑非笑地问道：乌龟味道咋样啊？众人听了这话，均是一头雾水，不由得面面相觑：少爷这话是啥意思？却有个汉子不自觉地腿抖起来。身子不住颤抖，神色慌张恐惧。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.