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三年前，云青岩从凡人界意外坠入仙界。三千年后，他成为叱咤仙界的云帝。破开虚空，回到凡人界的云青岩发现这里的时间只过了三年。曾经，我没有实力守护心爱之人，如今，我要整个世界匍匐在我脚下。受到歌剧院老板黑泽和马的邀请，金田一、美雪和剑持警部再次造访歌岛。金田一不知为何有种不祥的预感，他的预感果然实现了。和怪人幽灵寄来的预告书一样，在密室状态下的剧场里饰演卡尔罗达的女演员遭到残杀，从此揭开了连续杀人的序幕！香云急忙想要阻止，几人早进去了。Three handshakes.A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.Int result = cal.calculate (exp, "\ +");Defense method: The defense against CC attacks needs to be combined with the characteristics of the specific business, A series of defense models are established for specific services, such as connection feature model, client behavior model, service access feature model, etc. Receiving client statistics of customer information and carrying out a series of processing according to model features, including blacklisting, limiting access rate, randomly discarding requests, etc.