欧美A一

Original address: https://www.jianshu.com/p/9fc41ea941aa让人意想不到的事情都发生在越国，江东真是个神奇的地方。After review, the fire protection technical service institution no longer meets the qualification conditions, or has violated the provisions of Article 47 and Paragraph 1 of Article 50 more than three times within the validity period of the qualification certificate, shall not go through the renewal procedures.一群大学生，他们敢于测试城市传说中的任何人，只要穿过一座幽灵般的桥——一个女人曾经在桥上自杀的地方——在m.77午夜密克罗尼西亚联邦会发现邪恶在等着他们。[Skills of Running Business] How to Run Business and Find Customers at the Beginning of Running Business?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.