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There is a key point here. Once you get on the CDN, don't disclose the IP address of the source server, otherwise the attacker can bypass the CDN and directly attack the source server. All previous efforts are in vain. Search for "bypassing CDN to obtain real IP addresses" and you will know how rampant the domestic black industry is.而徽王府，就是一个完全解除限制的**大舞台，并非杨长帆轻于法纪，只因这个时代就是如此的疯狂，敢于冒险的野心家吃遍天下。It should be noted that I am not proficient in DDOS and never thought I would be the target of attack. After the attack, many unknown friends provided all kinds of help and suggestions, which made me learn a lot. Here are some of the solutions that are most helpful to me.[Publisher]: Ministry of Labour and Social SecurityIf 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"作为从沛县开始最早跟随在刘邦身边的人，夏侯婴很了解刘邦，他比谁都清楚刘三哥的志向与抱负。