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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.翘儿焦急上前，风铃呢？不会是被官府收了吧？呵呵，少夫人，官府可来不及收。Orange: madder, goldthread (coptis chinensis), onion, peach...一位已婚的好莱坞特工收到一封关于匿名性接触的神秘信件，并陷入了一个充满谎言、不忠和数字数据的险恶世界。1. Create a new "test" folder under the root directory of disk D, create a new txt file in the "test" folder, and rename it to "test1. Java".英布听得分明，如今这样一来，自己和岳父两家人就欠了尹旭三份情……吴臣低声道：那怎么办？我们如何还？吴芮的目光转而落到英布身上，沉吟道：如今只能你自己去一遭了，尹旭到底想要干什么，去了也就知道了。(12.20 update)