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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.At the end of the article, I couldn't help sharing her famous work: "Go to sleep with you through more than half of China".却也并未太当一回事情打开了帛书，可是看到帛书上的字迹和内容时，韩信如遭雷击，顿时愕然当场。不过是侥幸活命而已，现在还来的及压制，他刘邦想要翻出点浪花……哼哼，没有那个机会。绿萝心里似乎难以生出半点怒意，有些不敢和尹旭对视，似乎有些想要逃避的意思。蛋疼哥，《网上高人》河中的流水，《我叫王大锤》。