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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.1970年的一个夏日，暗流大队湖边寨生产队的集体户里只有柯碧舟一人在埋头创作他的小说《天天如此》，其他上海知青全都赶场去了。一场突如其来的瓢泼大雨把一个体形颀长、充满生气的姑娘送到了柯碧舟面前——她是偶然跑到这里避雨的，名叫杜见春。忙推了她一把：淼淼，你将来可是将军夫人哩，好威风的……话还没说完，秦淼就哇地一声哭了起来。多亏阎大人求情，才戴罪立功留下来，这两年九哥一直耿耿于怀报仇之事。几间房子也几乎夷为平地，最为严重的神女的雕塑也因为风吹日晒而倒塌。身为重案组里唯一的女性成员，简（安吉·哈蒙 Angie Harmon 饰）可一点也不输给她那些精明强干的男同事们。对于简来说，没有什么比时时保持警惕更为重要的了，她的那股子劲头，仿佛是在和整个世界作战。