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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.2017-07-22 15:41:20　　麦克莱恩通过无线电与鲍威尔保持着联系。然而赶到的警方负责人的官僚作风却给他添了不少麻烦。他一面与匪徒作战，一面还要帮助警方消灭匪徒的导弹发射器。匪首汉斯与麦克莱恩之间展开了一场斗智斗勇的较量。而赶到的联邦调查局官员的愚蠢自大的行动更帮助匪徒们开启了金库，达到了目的。这一切都使麦克莱恩的处境更加困难。众女看着他偷笑，面上现出了然的神情，看香儿的目光就透着些异样，不过却无人出言嘲笑，显是素有教养忽然香儿脆生生地答道：小女子是崇阳街‘农家园圃的掌柜，今儿上门来叨扰世子爷，是想打听些新闻故事。然后，他摆摆手，又说道：就在刚才，我已经想到了一个打败天启的好办法，这次必定万无一失。　　连长丁浩(李兴文饰演)在安邦的身上，似乎看见了自己过去的影子。当年他训练新兵时也同样严格，同样铁面无私，但却因为管教不当发生意外，让他多年来荣升不上，使自己成为全国最老的连长。热血的孙安邦，是否能唤醒丁浩昔日的澎湃热情？And what Wang Zeduan said about him, Liu Guangyuan, who provided oral memories earlier, He was the only survivor of the four soldiers who had rebuilt the minefield at that time. In the memory just now, He has been blaming himself for running back alone as the first-line witness of that year but failing to save his comrades. At that point, I choked up several times and couldn't speak, and asked that I didn't want to think more about the events of that year. I respected his request, so I didn't urge him to ask, and I didn't record the information about this period of history from Liu Guangyuan's perspective. It was still regrettable from my heart, but fortunately, Wang Zeduan's memory filled the gap to a large extent.