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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.但要是不斩草除根，放虎归山将来必有后患。The above hope can help you.在艰难的一年之后，毕晓普、派克和他的家人试图放松一下，但很快发现自己陷入了一个年轻女孩的可怕绑架中。当天早些时候，毕晓普和派克与小女孩的父母成了朋友，他们决定用自己的专长帮助这对夫妇把女儿争取回来是他们的责任。绑匪要求得到一笔不合理的报酬，以使女孩安全返回，但不知道他们现在面对的是谁。Query the planned and unplanned issuing status in the production order.