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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.所有的士兵都清楚地知道一个事实，那就是身后已经没有退路。《靴靴惹爱情第一季》剧情描述的是四个女人对应不同的鞋子象征四种不同的爱情，每个女人有两个纠结的男人，到底会选哪一位呢？Lifetime今天宣布，《美女上错身》（DropDeadDiva）第二季将于6月6日开播。第二季依旧13集。另外前《美国偶像》评委PaulaAbdul在第二季中将继续客座演出法官。《美女上错身》讲述一位美女上天的灵魂附到了一位胖女律师的身上，从此这位胖女子的生活，事业都起了不小的波澜。这部喜剧色彩的律政剧穿插着生活、工作，谈感情和事业，插曲也很好听。这部剧仍然强烈推荐给女性观众。哎呀。赏罚分明。Telecommunications