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这一切，只为了那被99.9%的有罪率所掩盖下的0.1%的真相……SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.欧洲伦敦，至高无上的尼古丁吸血鬼家族雄霸一方，建立了独立的吸血鬼王国，雄心万丈的吸血鬼王老古丁，利用忠实买通王友仁，设计诱惑大量华人进入吸血鬼城堡，企图把吸血鬼王国的力量渗透进亚洲……一片虚空之中，现出一座高台，高台通体金黄，万丈宽广，上面浮现封神台三字。15岁的科学家阿什利·加西亚（Ashley Garcia）在全国各地从事机器人职业后，探索了现代世纪的伟大未知。这时候