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Article 29 A fire-fighting technical service institution shall set up a technical person in charge to supervise and manage the quality of the fire-fighting technical service of the institution and to conduct technical review of the written conclusion documents issued. The technical person-in-charge shall have the qualification of a registered fire engineer, and the technical person-in-charge of a fire technical service institution with first-level qualification and second-level qualification shall have the qualification of a first-level registered fire engineer."Yes, even if you go underground, those who drill shallower can still be powerful. There is really nothing you can do about those who drill deeper. You can only stare and wait for them to come forward and come out before hitting. That is very dangerous. This is why many comrades were killed and bitten by them." Zhang Xiaobo said.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.　　被喜欢的男生告白、有生以来第一次交到了男朋友的亚由美，却在初次约会这天和班级里遭人嫌弃的然子交换了身体...!?——就算我不再是我，你也会爱著我吗？@ Override如果追上了，不是倭寇，那你是谎报军情，找罪受