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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.　　徐百九(金城武饰)为了调查两个强盗之死而来到小镇，看似意外死于刘金喜的自卫反应的两人，居然竟是武功高强的十大逃犯，一个手无寸铁的村民如何能够打死他们呢？对武术颇有研究的徐百九认定这绝不是意外，刘金喜必然是身怀绝技才能如此杀人于无形。随着追查的深入，徐百九发现他与72地煞——江湖中最为残暴邪恶、杀人不眨眼的组织联系紧密。而72地煞的教主，武艺则更是深不可测，无人能及。板栗看呆了。《谁在撒谎》第二季即将于2020年3月在英国独立电视台播出。新一季剧情将围绕安德鲁之死这一悬念展开，依然由Jack Williams和Harry Williams担任编剧，两位主角Joanne Froggatt和Ioan Gruffudd也将回归。剧情承接上一季结尾，安德鲁死后，劳拉成了头号嫌犯，她的生活并没有变好，反而陷入了更糟糕的境地。调查安德鲁之死的真相，将成为第二季的主要剧情……面对质询，范文轲答道：项梁之死，项家子弟和门客臣子必定对令尹您心怀怨恨，近来会有许多摩擦是必然的，说不定还会严重冲突。SubReactor----a NioEventLoop in the workerGroup (NioEventLoopGroup)