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Chapter II Supervision InstitutionsWe 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.故事从一场告白开始。袁湘琴是一个单纯开朗傻得可爱的女学生。在高中的开学典礼上她看到代表新生致词的江直树，便深深喜欢上了这个外表冷漠倔强IQ200的天才。在快毕业的时候，湘琴终于鼓起勇气，决定向这个暗恋了2年多的男生告白，却在大庭广众之下因为鲁莽而被拒绝。谁料祸不单行，湘琴家的房子又因二级地震震倒。湘琴与相依为命的父亲已一无所有，正当穷困潦倒之际，却偶遇了同是袁父国中好友的阿利叔叔和她的妻子，并被邀请到其家同住。而更令湘琴吃惊的是，自己居然要和江直树开始“同居”的生活。湘琴艰辛的爱情之路由此展开。面对着这个自己从第一眼就认定并爱了五年的男生，湘琴能将他冷漠的心门打开吗？这样一个执着的女生，最后能追求到想要的爱情吗？Crazy Ryan该剧讲述了一个拥有三个不同姓氏的充满矛盾的平凡家庭的故事。3. Return to the environment variable interface entered in the first step, as shown in the figure, and create a new system variable in the following:林聪，你想谋害上官不成？林聪摇头道：下面有水，跳下去不会摔死的。