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啊？苏樱一惊。乔星（陈豪饰）、阎武（黎耀祥饰），一个是如日中天的神级杀手，一个是风光不再的潦倒杀手。两人却有着共同的敌人，联手复仇令他们结下不解之缘。 “杀手猎人”的出现却威胁著整个杀手界。杀手、清道夫、经理人悉数出手拆解危局。杀手界外的单亲妈妈向茜（李佳芯饰）、一楼一凤姐淑娴（江美仪饰），也因与乔星、阎武的感情被卷入危机……乔星为解决杀手猎人，竟导致阎武之女重伤昏迷。阎武为向女儿交代，必须杀乔星；乔星为了向茜，必须活下去。两代杀手之王，最终走向了没有退路的对决……Article 20 Scope of ApplicationSYN 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.英剧《设得兰谜案》第三季已获得BBC预定，依旧由Douglas Henshall出演主角侦探Jimmy Perez，预计于2015年拍摄，2016年在BBC1播出。不同之前两季一案两集的模式，第三季将会用全部六集篇幅讲述一个完整的案件。