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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.所以此时此刻，只能够克制住自己心中的兴奋，表现的淡定从容，好还应对汉王刘邦的问话。(1) The utility model provides a low-temperature stop valve, wherein a guide sleeve is added at the valve disc, and is fixed by bolts and elastic pads, so as to position and guide the seal of the valve; ;PS: The above articles are published or reprinted by Xingtian Network. Xingtian DDOS: Create the greenest and most stable DDOS attacker! Official website:在济世堂主持事务的是秦枫大徒弟方虎，他正帮人瞧病，听见门房传来吵闹声，咒了下眉头，让一个小弟子出去查看。Lins Concubine 10