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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.The Tumor of the Theatre请宽限一些，船主该知道，路途很远。只是我想着，无论学什么东西，都不能生搬硬套，要灵活运用才好。Stephen was hiding in the corner, Looking at the spring scenery here, His obsessed man was straddling the other himself, He said some blunt words without hesitation. Looking at the "magician" red face still quite proud, dragging the person's collar paste up, as if to show off his kissing skills, Stephen looked at Tony under the "oneself" soft into a pool of spring water, eyes are full of "oneself" and lust, open arms at "oneself"-that is the posture of demanding, Tony's red and purple crisscrossed marks, marking the intensity of the sex, also let Stephen feel confused