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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.In the experience process designed by Tang Yulong, he understood the symptoms of the consultant through three days, and designed scripts for specific problems, with experienced consultants playing the roles of husband, child, parent or colleague of the consultant. On the day of the death experience, five or six square meters of body　　欲火蝴蝶　马师傅一日走在熙攘大街上，见绿草红花掩映间有华山二字。马师傅两目微合，开始了与各大武林高手对决的巅峰时刻。你的帖子写得很好，我给你加精置顶。《白雪公主之神秘爸爸》 集亲情、喜剧、冒险于一体，讲述了白雪公主和小矮人为帮助小女孩汉娜寻找爸爸而一起展开的冒险旅程。我也不瞒着二位，我心里确实一口气难平。