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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.天启，只要练霓裳和卓一航能在一起，我们还是朋友，否则，哼。很快，继玄铁重剑重现江湖、不逊色独孤求败的武道大宗师，又有小道消息传出来。一切都只能是脑海中的幻想，必须在须臾间永远的忘却。Recommendation Order　　《公元1921》，讲述的是中国共产党成立的过程。