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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.谁都跟她一样，整天折腾。一八路军战士缴获了日军的战略进攻地图，但无奈身负重伤，只得将地图交给自己的农民弟弟二柱，拜托其赶到火车站把地图送给同志。与此同时，来自东北的秦贵（黄宏 饰）被掌柜委派，去火车站接收地图，另一方面，立志加入八路军抗日的弹棉花农民老幺（魏宗万 饰）和自家年轻的叔叔顺子（赵亮 饰）四处寻找八路军的队伍，叔侄俩在茶馆中偶遇擅长口技的说书人（徐玉琨 饰），三人在日本军官佐佐木一郎（孙敏 饰）带队追索地图的枪火中救下了已经受伤的二柱，说书人顶替二柱交接地图，老幺和顺子则一路狂奔引开了佐佐木的队伍。在火车站，秦贵误认说书人是八路军接头人从而死缠不放，随后赶到的老幺和顺子短暂汇合后四人被日军的炮火再次打散，秦贵、老幺和说书人被困地窖，顺子去邻村搬来村民搭救，一场普通人和鬼子的追逐好戏正式上演……刘一手（孙松 饰）是当地围棋圈里的名人，由于下岗多年无以为计，他只好在棋社教棋挣点外快。刘妻（孟海燕 饰）看不惯丈夫痴迷围棋无力养家，于是提出离婚，儿子小川（王成阳 饰）毫不犹豫选择了跟着爸爸。离婚后的刘一手为给儿子交学费，在董佳（王景春 饰）安排下与他人赌棋，不料被警察抓个正着。面对小川刘一手悔恨万分，他立誓戒赌，在儿子面前重塑形象。一个偶然的机会，刘一手发现了儿子下棋的天赋，他决定送儿子到正规棋院深造，无奈天文般的学费令他却步。无奈的刘一手撕下老脸偷艺，遭到大师们侮辱。目睹此景的小川暗自发誓，决不再让爸爸的尊严遭人践踏，一定要当冠军。于是，父子俩制订独有的训练方法，向未来目标发起了冲击......徐文长低声道，我倒看他不是有意诬你。没事的时候，一切都好。