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Return null;That is to say, a total of false syn messages will occupy the TCP preparation queue for 63s, while the semi-connected queue defaults to 1024, which is different by system default and can be viewed by cat/proc/sys/net/ipv4/tcp_max_syn_backlog c. That is to say, sending 200 fake syn packets per second without any protection is enough to burst the semi-connection queue, thus preventing the real connection from being established and responding to normal requests. The end result is that the server has no time to ignore the normal connection request-denial of service.Some timing operations on data no longer rely on external programs, but directly use the functions provided by the database itself.When setting up a network, the selected network cable must have flame resistance to reduce the probability of fire. Generally, the rubber outside the real network cable is flame-resistant, which is a national mandatory standard. However, fake network cables are often made of common flammable materials. When we buy network cables at ordinary times, we can also use this feature to identify the authenticity of network cables.3. Use lemon, grapefruit peel, etc. to effectively remove peculiar smell. Buy a lemon or have we eaten it? Pomelo peel, is it suitable to stop in the car? Location.