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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.But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows:At that time, mobile phones were still like this.我们会解决顾客的任何“困扰”！　飞机上的一个乘客突然变得癫狂，又遭遇到飞机强气流，待一切平稳下来，这名乘客已经突发性脑水肿死亡。而这名乘客身份并不普通。他是某保姆单位的高级研究人员，因涉嫌向外间谍组织出卖国家情报而遭到了有关部门的监控。他的离奇死亡使得这场监控和追捕遭到了停滞。而这时，国安局逮住了死者的弟弟王浩。于是想出一计，让侦查员沈亢（孙红雷 饰）扮成王浩，进而引蛇出洞。而这场卧底追捕，与王浩的中间联系人就是飞机上的空姐李小晚（傅晶 饰）。二人在一来二往中，互生情愫。但无奈卧底的身份不得暴露，小晚则纠结王浩黑社会的身份。(1) ack reflex attack