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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.再次……就是毛海峰狗急跳墙，自己拼死一战。Zhang Jie, born on December 20, 1982 in Chengdu, Sichuan, graduated from Sichuan Normal University, is a mainland pop male singer and founder of the music brand "Planet Culture".外婆，你给我跟哥哥准备了啥生日礼？张老太太忍不住笑了起来，白了孙女一眼道：你这娃儿，咋跟外婆要东西哩。MinLength: 6: is a string separated by a colon, the minLength in front of the colon represents the strategys object selected by the customer, the number 6 after the colon represents the parameters that must be verified during the validation process, and the minLength: 6 means that the value of the validation registerForm.password text input box has a minimum length of 6 bits; If the string does not contain colons, no additional validation information is needed during validation.《咕噜咕噜美人鱼》是浙江新长城动漫有限公司出品的动画电影，由杨广福执导，张美娟、赵梦娇、陈大刚等联袂配音。该片讲述了一条遭遇海怪袭击的美人鱼，凭借自身的勇敢和小伙伴们的帮助，救赎亲人、回归家园的故事。