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In general: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.哼，你要是没有捣乱，我会撒你吗？吕馨还嫌不出气，便在陈启手臂上掐了一下。怀揣梦想的平凡少女沈螺，远离喧嚣的城市，回到安静的海岛生活。不料偶然间救起一个叫吴居蓝的男子，竟然是个和人类的进化方向完全不同、来自大海的高等生命体——鲛人。他以不凡的能力和智慧一次又一次地帮助沈螺度过难关，战胜危机，深深地吸引了沈螺。两人一路磕磕绊绊，从互相了解到互相信任，最后产生了深深的爱情。　　在首领叶飞的领导下，众人在交易地点上为夺取两张有关军火资料的电脑磁碟展开生死战。过程中，叶飞与一神秘女子方盈大打出手，一段扑逆迷离的感情在不自觉间发生。叶飞虽然最后能夺取其中一张磁碟，可是却招来其上司杀子之祸，同时自己亦被陷害而踏上逃亡之路，幸得方盈相助才能脱离困境。　　时光一晃，六七年岁月转瞬即逝。魏氏夫妇已育有一双子女。魏端本供职于某政府机关，他老实诚恳，迂腐木讷，以稀薄的工资支撑着这个小家；田佩芝虽为人母，却始终保持着天真活泼的性格，难耐贫苦无聊生活且虚荣浮华的她迷上赌博，从最初的小打小闹到后来的大出大进，导致家中的生活愈加捉襟见肘，夫妻间的口角也成家常便饭。导演率领拍摄组来到神秘的骷髅岛开始了一部电影的拍摄，女主角是漂亮娇小的安，她在纽约的演艺事业陷入了低谷，这是她时来运转的大好机会。他们乘坐轮船来到岛上，却不知在岛上即将要险象横生。正当导演要开始开机拍摄时，他们遭到了当地土著的袭击，几个随行人员遇难身亡。摄制组幸好起航离去，却发现不见了女主角安。原来安土著野人抓走，被当作祭品。安尖声惊叫，引来了传说中骷髅岛的猩猩——金刚的关注。金刚在岛上很有霸气，连恐龙都要忌它几分。然而，野兽爱上了美人，金刚搭救安脱离困境，不料却让自己陷入了一场悲剧.....