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It can be said that cancer is a chronic disease, and-Side lights, 3 nautical miles;TCP Flood如此我们占领淮南就显得名正言顺，还能得赢得感激和赞扬。If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. The end result is that the server has no time to ignore the normal connection request-denial of service. If you look at the SYN_RECV status on the server with the netstat-an command, you can see that there are a large number of connection states that are "SYN_RECEIVED"营指挥使虽然心里打鼓，却不大相信。WAF is needed if you want more precise control (such as automatically identifying and intercepting frequently requested IP addresses). It will not be introduced in detail here. Please refer to here and here for the settings of NGINX.