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[]张良迟疑片刻，这才说道：汉王，夫人和公子，公主，还有汉王的父母兄嫂尚且在西楚国为质。Release (event)During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.80后小夫妻白鹏和小洋遭遇财务危机，几个月没有稿费进账的丈夫、自由作家白鹏只能肩负起带孩子的重任，这对萌娃囧爸状况不断，最终建立深厚父子情。何心隐闻言大笑：要船主称你为兄长么？迪哥脸一红，尴尬道：那就叫……迪弟吧……三人闻言大笑，何心隐徐文长皆透来肯定之色。When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.Provides an interface to create a series of related or interdependent objects without specifying their specific classes.