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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.　　绿和三岛并不知道，他们之间的羁绊还远远未曾结束……打算徒步走遍全国的男孩高飞旅途中迷了路，误入一个在地图上根本找不到的城市——“篮球部落”，篮球热潮在这个城市弥漫，所有人都在打球、赛球、看球、谈球。高飞无意中显露出过人的弹跳和反应，被认为是最有希望的新星而遭到各大球队争抢，高飞狼狈逃窜，被篮球酒吧的厨师叶雯救下。篮球部落第一高手风雪新为了追求女孩罗敏敏，冒天下之大不韪离开效力多年的东方不败球队，而投奔由罗敏敏组织的新空气队，在篮球部落引起轩然大波。风雪新来酒吧退还从未谋面的叶雯写给他的情书和礼物，让叶雯很受伤。本打算离开此地继续旅行的高飞顾及叶雯的情绪，暂时留了下来……Super is privilege. Nothing specialThe basis is: among the attributes obtained from equipment and other sources, the attack: health is about 1: 6, for example, the unicorn fairy has 8% extra health damage, every 6 blood points can be exchanged for 0.48 damage, and the defense is ignored. This is 50% or more higher than the revenue of choosing a 1-point attack. At the same time, the viability brought by blood volume can also be better output.巴斯光年的故事和他到无限远的冒险。兵马未动，粮草先行。