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Result or commentAdd the following code to "TestSpring":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.　　仅7天的浪漫第二季　　贺雪薇为了帮助萧文解脱而查阅了有关资料并约伍兵前往图书馆看结论但被萧文发现萧文怀疑加重这时长风集团老总、从小暗恋贺雪薇贩毒头目--司徒杰又找上了贺雪薇…….(1) Register an Acceptor event handler into mainReactor. The event concerned by the Acceptor event handler is ACCEPT event, so mainReactor will listen to the connection request event (ACCEPT event) initiated by the client to the server. Start the event loop for mainReactor.全剧过程，峰回路转，揭发了许多令人意想不到的情景，构成一幕连一幕的高潮，他们的矛盾冲突也形成了迭起的激情。