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For spoofing attacks, the first thing to consider is to choose the address. For the attack to succeed, the host on the spoofed IP address must not respond to any SYN-ACK packets sent to them. A very simple method that an attacker can use is to disguise only one source IP address, and this IP address will not respond to SYN-ACK packets, perhaps because there is no host on this IP address at all, or because some configuration has been made to the address or network properties of the host. Another option is to disguise many source addresses, and attackers will assume that hosts on some of these disguised addresses will not respond to SYN-ACK packets. To implement this method, you need to recycle the addresses on the list of source IP addresses that the server wants to connect to, or make the same modifications to hosts in a subnet.1960年，中国登山队向珠峰发起冲刺，完成了世界首次北坡登顶这一不可能的任务。15 年后，方五洲和曲松林在气象学家徐缨的帮助下，带领李国梁、杨光等年轻队员再次挑战世界之巅。迎接他们的将是更加 严酷的现实，也是生与死的挑战......现在关键的是如何应对眼前的局势。故事发生在一个偏远沙漠中的矿业小镇。殖民超级大国为了消灭澳洲原住民（澳大利亚原住民和托雷斯海峡岛民），在1788年把最后一个吸血鬼据点中的一族，从英国运到了澳大利亚。这些吸血鬼为了躲避阳光，潜伏在小镇四周的地下矿井和隧道中，一直到了今天。这些殖民者的数量在增加，饥饿感也越来越强烈，战争即将来临。                                    　　有一天，父亲给她们带回了年轻漂亮的继母，自此以后，家里便开始接连不断地发生怪事。在继母到来的第一晚，淑然梦游一样地走到姐姐淑美的房间，像是看见了亲生母亲的鬼魂。接着，继母饲养的雀鸟突然中毒死亡，而她怀疑这是淑然干的，于是对淑然严加监视。而淑美则觉得继母偏心，三人间的关系更显恶劣。终于，两姐妹的爸爸莫云回家了，同时间，两姐妹却发现继母的房间里出现大量的血渍，在一个染满血迹的大麻袋里，似乎还装着一个被残酷肢解的人......张老太太赞同道：可不就是这么回事。