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徐风看他挂个灯笼还抖来抖去的就十分不爽，直接抢过灯笼，我自己来。喜羊羊与灰太狼之兔年顶呱呱 电影海报她并未察觉到，两腮依旧一抹淡淡的绯红，已经将她的很多心思出卖……尹旭看在眼里，并不提及，也不点破，微笑道：是专业的。尸兄同名网剧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.That is to say, the less a class knows about the classes it depends on, the better. In other words, no matter how complex the dependent class is, the logic should be encapsulated inside the method and provided to the outside through the public method. In this way, when the dependent class changes, it can minimize the impact on the class.