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就跟那年咱们家失火一样，我们一家人被大火围着没处逃，我也是着急，也不担心，后来我们就从地下逃出来了。公婆不知太后找她们母女干什么，着急的很，这时候肯定等着呢。要是黄豆说了这话，他是一准要笑的。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.这一切，只为了那被99.9%的有罪率所掩盖下的0.1%的真相……当这位新生的医生来到维多利亚时代的伦敦时，他发现泰晤士河中有一只恐龙猖獗，并有大量致命的自燃。