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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.二十年前，一对外星父子随一颗陨石流落地球…Int arrayInt [] = split (exp, "\ +");不远处海面上泛起一坨不矮的浪花。南京名门望族罗氏家族三个同父异母和同母异父的兄弟，因上一代的情感恩怨天各一方。1937年，日军的蹄铁践踏中华大地，家破人亡、流离失所的三兄弟机缘巧合的再次相见。国难当头，三兄弟放弃个人恩怨，在兄长共产党员顾世民的带领下，利用各自优势所长，在抗战大业中屡立奇功。一次突发事件，罗也夫查出日军正在秘密研制“觉醒剂”化学武器，欲以自杀式人肉炸弹轰炸重庆指挥中心。罗也夫凭借自己的专业知识，勇敢地打入敌人内部。期间，他受到恋人的误解，同胞们的责骂，危机四伏的杀机。最后罗也夫、顾世民、罗也君三兄弟携手抗敌，凭借坚强的信念，不屈不饶的狼性精神，成功炸毁了日军化学武器军工厂 。掉落的飞机残骸砸中了怀特家的房子，沃尔特(RJ·米特饰)的妻子斯凯勒(安娜·古恩饰)戳穿了丈夫的谎言并决定离开他。同时，沃尔特将面对一桩三百万美元的生意，但是此时的沃尔特生活已经再度发生大变故，钱财对于他来说还有意义吗？这桩买卖他拒绝得了吗？能出得起三亿美元的买家是什么来头？沃尔特将面对一个更可怕的对手。