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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.5-3 attacks 7-2 end up together, because although the 5-3 monster has a higher life value, the opponent's attack power exceeds the 5-3 life value (3 points), so 5-3 will be destroyed. On the other hand, 7-2 has only 2 blood, so the 5-attack will destroy him.大苞谷笑道：自然是姓张，如今张家可是王爵在身。她怕一抬头就看见熟人，还怕一转眼就看见亲人，又怕一不小心就被人看出破绽，认出自己来。河朔草原，初春已经来临，但是北风吹来依旧寒意浓重，打在脸上有如刀割一般。Number of plaintiffs: multipleSelect the appropriate system.