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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.　　许逃亡途中路遇昔日的朋友王小兵借钱给女儿看病。随后王小兵被人殴打，导致许德才丢了箱子，他的证件和机票在箱中。王将 丹波哲郎 後藤えり子Some people may have embarked on a one-way trip to death 1-3 months in advance, during which some changes will occur.In other words, the rules in each "chain" exist in which "tables".在庄稼丰收的时候，小镇上举行了狂欢活动，突然，一阵琴声从钟楼最高处传了出来，那女孩又要开始唱歌了，她的歌声讲述了一段最荒诞的爱情故事……In the termination phase of tcp connection, the connection between the client and the server is usually cut off through four interactions of messages with fin flags. However, when one of the clients or servers has abnormal conditions and cannot normally complete four tcp waves to terminate the connection, RST messages will be used to forcibly interrupt the connection.