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People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.For attackers, they do not need to care about the results of server-side decryption and authentication, so it is also easy to quickly construct the request data and ensure that less resources are consumed.过了5年，近未来的东京。表面上看上去是座繁荣的巨大都市，实际上却已经走向了毁灭的边缘。两极化，犯罪都市。町田惨剧中唯一一个生还者申道兰丸，为了寻找事件的真相成为了警察。……顾小玉走出王治乾的办公室。Then, let more white-collar workers become migrant workers, because of the high wages, and while young can exercise themselves, lay the foundation for the future life, make long-term plans; On the other hand, as wages rise, migrant workers will also be eliminated from the competition and will find ways to improve their quality and obtain better jobs. Only when the economic development really reaches a relative balance can it develop smoothly and healthily, and the promulgation of this regulation plays this role.During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.