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《浴血黑帮》一次性获得第四季和第五季续订。二战后，美国作家马丁（约瑟夫•科顿 Joseph Cotten 饰）应好友哈里（奥逊•威尔斯 Orson Welles 饰）邀请到维也纳工作，岂料刚到达目的地就传来了哈里车祸身亡的消息。哈里葬礼上，马丁遇到了当地军官卡洛维，卡洛维很不客气的请他马上离开维也纳。马丁没有理会，决心留下调查出好友死亡的真相。 马丁找到哈里的女友斯科姆特小姐（阿莉达•瓦莉 Alida Valli 饰）一起调查事件的真相。随着调查的深入，他们发现内幕越加扑朔迷离，首先是他们的房东遇害，接着马丁自己发现被人跟踪，而且他查出哈里死的时候还有个第三人在场。于是，一切关键就在于找出这个神秘的第三人。两名倒霉的电视技术员无意间撞见谋杀现场。为了避免成为嫌疑犯，二人采取了行动，结果每一步都弄巧成拙。Suppose the attacker is in an "interconnected" network (e.g. An Autonomous system? System), whose ISP restricts the input and output filtering of the attacker's network traffic, will be able to prevent this spoofing attack-if this method can be deployed to the correct location by the organization. This defense method of traffic input and output filtering will restrict some legitimate communications, such as the mobile IP triangular routing operation mode, so it cannot be widely deployed. IP Security Protocol (IPsec) also provides an excellent way to resist spoofing packets, but this protocol cannot be used due to deployment restrictions. Since it is usually impossible for the server side to require the ISP of the link initiator to implement address filtering or require it to use IP security protocols, more complex solutions are needed to resist this spoofing attack disguised as multiple addresses, which will be discussed later.