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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.韩信回到军营之后，立即问道：司马欣那边有回音了吗？禀元帅，司马欣已经回话了，彭城那边来了消息，让章邯节制关中兵马，抵挡我们。由《伍秋月》、《劳山道士》、《美人首》三个故事组成。《伍秋月》青年王鼎借宿伍家花园, 梦中有少女委身相许, 事后遗下髮簪. 翌日, 守园老人见鼎手执髮簪, 大喜, 告知园主三十年前去世时遗言鼎会到访. 是夜, 梦中人再度现身, 自称伍秋月, 已死去三十年, 但立春后可还阳嫁鼎. 鼎求月带他游地狱,。《劳山道士》王七游手好閒, 妻勤俭贤淑, 织布养家. 一日, 七与妻争执后离家, 遇劳山道士. 道士埋梨核于土中, 顷刻梨树长成. 七求道士收为徒, 道士授七穿牆之术. 七学成后, 以穿牆术入怡红院, 遇妓女富贵花, 二人合谋盗庞大户金库. 不料事败, 人赃俱获。《美人首》李生夜访粉黛山庄, 途中偶救一自缢少女, 少女忽身首分离. 李吓得落荒而逃, 失足堕陷阱, 幸为猎人所救. 归途中, 李邂逅阿纤, 二人一见锺情。讲述了Stuart Townsend饰演的特工试图揭开真相找出自己身份的故事。颈部有罗马数字的纹身，杀手十三是一个忘记了过去的前特工。他遭到一个黑暗的反政府机构追杀，试图通过蛛丝马迹找出自己的身份，以及他所携带的秘密。他很快意识到当他自己越接近谜团真相之际，整个事件变得更为复杂和危险。However, this is not the case. Plants also have sex and love. Until modern times, the secret of plant reproduction was completely uncovered. In the long process of evolution, they really exhausted their skills in order to survive.天启就是一个值得支持的作者。