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In fact, iptables is not a real firewall. We can understand it as a client agent. Users execute the user's security settings into the corresponding "security framework" through iptables. This "security framework" is the real firewall. The name of this framework is netfilter.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.When grandpa came to play, he was angry with grandpa: "why did you go there then? Why didn't you join the red army? If you had joined the army in those days, would my family be like this?"　　兰顿教授发现这一连串的线索原来有着令人震惊的关联：已故的馆长是锡安隐修会的成员 －锡安隐修会是一个真实存在的秘密组织，其中成员包括牛顿、波提切利 (Botticelli, Sandro)、雨果和达芬奇等人。至此兰顿才发现自己正在追踪一个石破天惊的历史大秘密，一个已经埋藏了几个世纪、既富启发性又危险的秘密。在这场遍及巴黎、伦敦和苏格兰的追逐中，兰顿和苏菲发现自己正在跟一个从来不肯露面的幕后主脑斗智斗力，这个人似乎总是知道他们下一步要做什么。除非他们可以解开这个错纵复杂的谜团，否则一个埋藏了二千年的秘密、一个极爆炸性的古老真相，将永远消失，而他俩的性命亦会危在旦夕…Faye Wong and Li Yapeng broke up peacefully. They still bless each other after their divorce, while Li Yapeng will still accompany their children frequently. Their daughter lives happily and confidently, without any lack of father's love.