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曹氏走过去，用帕子将他嘴边水渍擦了，嗔怪道：这都什么时候了，还想吃多少？玉米笑道：小婶婶，能吃是福。Command cmd = new MyCommand (receiver);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.……临淄，郦食其正在品尝鲜美的菜肴，欣赏齐女动人的舞蹈。A documentary show about troubled girls who are are juvenile delinquents in Madison Juvenile Center1999年 ルパン三世爱のダ?カーポ～FUJIKO'SUnluckyDays～ 爱的记号~不二子的倒霉日 ワタナベシンイチ