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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.As shown in the above figure, the server side provides NTP service. Attacker sends an NTP monlist Request to the server, but its source IP address is not its own IP address, but the IP address of the target. After the server receives the request, it will send a Response message to Target (not Attacker). Since Reponse contains 600 time synchronization records with Server, which is much larger than Request and consists of many messages, amplification is realized.三年前，他们来了，永远的改变了人类的未来。他们说他们只为和平而来，称呼自己为“盟友”。各国的领导人欢迎他们的到来，他们帮助解决了我们过去无法解决的难题：战争、饥荒和疾病。他们除了友谊，别无所求。盟友获得了很高的声望和爱戴。他们和世界上的国家，都建立了外交联系。但是这些友善动作的背后，似乎隐藏着什么……《那个年代》是以上世纪80年代末至上世纪90年代初深圳作为改革开放沿海城市的变化为大背景的都市情感剧，着力勾画深圳股市诞生的曲折历程。该剧最大的看点就是选取了证券市场发展鲜为人知的一段故事作为切入点，从而唤起观众对那段历史的回忆。该剧讲述了改革开放初期那个年代，一群年轻人怀着远大理想来到深圳开创事业，收获爱情的故事。罗震中复员回到家乡，接到在深圳的战友周元龙的来信，他推迟与未婚妻余莉结婚，踌躇满志地奔向深圳。途中他见义勇为，使大学生雷雪冰免遭盗窃，雷对他产生好感。刚到深圳的他遇到种种不顺，接着四处寻找工作，期间遇上了陈家兴等一群同样怀揣梦想的年轻人。他们凭着拼搏精神，白手起家，艰苦创业，最终成为优秀的企业家，拓展了自己事业的一片天空，也为深圳初期建设作出了贡献，实现了人生价值。Contrary to this, In many primary schools, in interviews for first-year students or parents' notices before the start of school, All of them have put forward very clear requirements on the number of English words, the number of ancient Chinese recitations, and the ability to calculate mathematics. This makes parents very anxious. If the children do not carry out relevant learning and accumulation in advance, they will probably not be able to adapt to the formal learning environment and gradually widen the gap with their peers if they enter primary school directly.叙述一个妓女为了教育儿子成材，不惜忍受一切耻辱。这个妓女被一个无赖逼得走投无路，结果杀了那个无赖因而被判刑二十年。满出狱时，她的儿子已经认不得她了。为了不影响儿子在社会上的地位和前途，她没有和儿子相认，悄悄地走了。在拉拉队中，艾迪•汉隆（Addy Hanlon）一直是贝丝•卡西迪（Beth Cassidy）最好的朋友，也是她最信任的副手。贝丝负责决策，艾迪负责执行，这一规则从很早前就制定并延续下来，帮助贝丝和艾迪达到了她们高中拉拉队事业的顶点。如今，她们作为资深成员,掌控着竞争激烈的拉拉队，受到其他女生的畏惧和服从——但在新教练来到之后，这种局面被打破了。 作为一个来自未知成人世界的使者，又酷又富有领导力的新教练柯莱特•弗伦奇（Colette French）吸引着艾迪和其他拉拉队员来到她的生活中。只有贝丝置身于教练的社交圈子之外，对这一新的等级制度感到不安。她设计安排了一场巧妙而恶毒的竞选，希望在拉拉队和好友艾迪面前赢回昔日的“女王”地位。 之后，一个自杀事件引起了警方对教练和拉拉队的调查。在一波震惊和哀悼之情平息之后，艾迪试图揭露自杀事件背后的真相。但她发现，忠诚与友谊之间的界限可能会是一个极其危险的地带。