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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.尹旭也从榻上做起来，不对劲。林大爷看见刚才的一幕，后悔极了，暗怪自己老糊涂，才害得大姑娘与人争吵。与此同时，在国内陪伴父母的费奥娜公主也遇上了不小的麻烦，大反派“魅力王子”纠结了一帮海盗卷土重来，阴谋篡位，费奥娜组织了一支妇女自救队，童话中的公主、母后们悉数上场，展开了搞笑连连的正义之战，及时赶王国的史莱克一行四人，也参加到了队伍中，“另类”大决战的序幕也就此拉开。Mild anemia has clear causes and good therapeutic effect.It can be seen in the figure that only the event handler from the module named is bound on.