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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.34岁的女编剧程璐（童瑶 饰）一直坚信，自己单身多年的原因不是结不了婚，只是不想结而已。无独有偶，她的闺蜜女律师田蕾（陈数 饰）、美容院老板娘丁诗雅（许芳铱 饰）同样单身，工作、生活条件优渥的三人对年龄增长所带来的婚恋压力嗤之以鼻。然而当程璐遇到社会心理学教授魏书（潘粤明 饰）后，情况悄然发生改变。背景各异的男人们出现在这三位女性面前，不同观念激烈碰撞，到底谁可以打动谁？应该怎样收获属于自己的幸福？一场关于爱情与婚姻的探索就此展开……玉米，也派了人监视。Notification (Advice)徐海被俘，汪直身死后，除徽王府外，海匪几乎各自为战，再无几年前那种像样的战役，明军没有总督，各巡抚将领反而愈挫愈勇，私兵逐渐壮大，外加有当年杨长帆留下的燧发铳和抗倭战术，打起来也是越来越难。　　八月十五前夕，眼看着地里的玉米一天天熟了起来，程子沟的老少爷们却没有想到对付山贼黄鼠的办法，个个只能哀声叹气。Use docker exec to enter the container to see if the volume/data exists: