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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.钱信伊：亚洲笑星闹美国. 在这部单口喜剧特辑中，钱信伊（《特雷弗·诺亚每日秀》《摘金奇缘》）登上舞台中央，并就当代美国生活等话题发表看法。林聪将她上下一扫，轻声坚定地说道：从上到下，都装扮成男人。这个还不简单。临走时，我专门见过臧荼、张耳和司马昂，知会他们这诸侯王是名正言顺，让他们一定做好。《江照黎明》是由牛超、王涛涛执导，马思纯、白客、刘凯、张瑶、高旭阳、张本煜、史可、郎月婷、赵淑珍、袁文康主演的现实主义女性悬疑话题剧