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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.淮南拿到手中，首战告捷，算是一个良好的开端吧，心中也踏实了许多。节目全程跟踪记录这一个月中，孩子如何支出这笔家庭开支，重点关注在这期间父母家人与青春期孩子之间的感情碰撞、观念冲突、利益纠葛和爱恨交织，最终让孩子学会如何有计划地理财，教会父母如何尊重孩子，走近孩子的内心，化解紧张的家庭关系，找寻家庭和谐稳定的根源。应国际联盟指示，国民政府派出一支"远东突击队"参战，但由于战线太长，"远东突击队"遭到日军的包围，情况十分危急，随时都有全军覆灭的可能。上级派出郑远桥假扮某一特殊任务亲属来到金三角地区，想利用坤沙的贩毒武装来解救"远东突击队"脱离陷境坤沙的军师说服坤沙，想设法收编这支队伍为已用，否则除之。坤沙的女儿爱上的郑桥，郑桥不为之所动，但去引起了军师对他身份的怀疑，郑桥身处陷境，稍有不慎，全盘皆输有发动进攻，郑桥说服坤沙女儿私自半路伏击日军。事后坤沙大发雷霆，关且和军师密谋，给郑桥两条路：一是娶坤沙女儿，二是带领队伍为坤沙贩毒作护卫。否则，立即杀掉郑桥，郑桥命在旦夕。First of all, we should do more work. If you always fight in the front line, you will certainly have more experience. Therefore, we must ensure that we have always been in important products and businesses, not divorced from practical operation and not doing pure management.