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此番乃是天赐良机，错过了着实可惜啊。忽抬头见前面山上也有一所庙宇，遂问道：那儿也是你们的？住持摇头道：不是。3. The code in the policy mode can be reused.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.先杀了再说？赵光头回身大骂：都闭嘴，听老夫人说完。Methodology is pieced together one by one in this way. After a long time, it can become its own methodology if it is systematized and systematized.你就不能想着干点别的？众人都议论纷纷起来，小葱见秦淼呆坐着不吱声。