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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.谋其政，还真是那个理儿。The TCP three-way handshake process is as follows:　　也许有的人需要物质的帮助，有的人更需要找到真情，同样的悲剧命运，一个个恶梦般的轮回，一场场黑暗中的决斗，让这个原本平凡的“单亲妈妈”成为了一个时而坎坷艰辛，时而绚丽多姿，充满离奇色彩故事的中心人物。在市井人物与豪门之间，在温饱与奢华之间，上演了一幕又一幕扣人心弦而又耐人寻味的故事。秦淼辈分高，找这样一个人还真不容易。5.2. 5 Flatness Design Requirements