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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.剧照 (6张)本剧讲述了大东奉盟主之令护送刘备回铁时空，但在过程中发生时空共震，被剧烈冲击力撞击的大东，睁开眼睛，发现自己竟然躺在女子更衣室的椅子上。从金宝三口中得知自己已消失了十年，而在此期间父母以及亚瑟和小雨为寻找自己而下落不明……能不能劝回嘉靖，要不要扳倒严党，这是只有陆炳自己内心才清楚的事情。郑氏摆手，示意她们坐下，便进屋去了。Contracting anti-smuggling ships was a profession in those days. Some ship owners went to check fishing boats in the nearby waters and fined those found smuggling. After collecting the fines, they handed over some of them to the state and the rest were owned by the ship owners themselves.