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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.This time, I hit a little singer who did not find this person in the face.2018年7月5日下午4：28，张清泉开始为林永澄补习。学习本是件枯燥无味又恼人的事，但因为你，它开始让人期待，快乐。抓紧我，别放手，这些细细碎碎的记忆，能支撑人们，走完这辈子。林聪见他着急难舍的样子，心中一跳，不敢深想，忙道：你将丰县治理好，军需能足额供给，便是帮了大忙了。就是说……‘还没过门呢。江成海冷哼一声，说道：我的小说几乎集合了之前所有武侠小说的爽点，大数据下，这是大众最喜欢看的武侠。还让不让人活了？这话问的，他还能把他们的大姐姐给吃了？现在是他被揍趴下了好不好。