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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.皮克斯发布《玩具总动员》新衍生短片《Lamp Life》预告，可爱。聚焦牧羊女的故事：她为何在外流浪，并跟被迫“跑路”的胡迪重逢？ 1月31日Disney+上线。一对情侣为解决情感矛盾，来到AI游戏里完成角色扮演任务。过程中，两人各自经历了令人啼笑皆非哭笑不得的事，最终，两人的情感问题得到了解决。在这6年后——。登录进新生《Re'Union》的高中生阳翔，在那里与本应死去的儿时好友·旭姬重逢了。她到底是电子的幽灵，还是……？这是在网络游戏中编织而成的儿时好友们的“约定”的故事。一日，二少爷尚鋆携家眷一起回到了尚家探亲，从此原本平静的尚家便激起许多波浪。二少爷长期受到民主、人权的思想渲染，和思想守旧、自私自利的大少爷处处发生冲突，两人经常在争吵得面红耳赤。为了推翻大少爷的“封建统治”，二少爷决定留下来争夺尚银楼的当家之位。另一方面，秀杏终于得知了当年的真相，原本善良的她为了报复尚家，慢慢变得心狠手辣起来……有点门路的，还挑唆御史上书弹劾。