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So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables.中华人民共和国成立前后的1949年末，被称作“中国的盲肠”的湘西，在绵延起伏的十万大山里，仍然有号称“十万大山十万军”的湘西群匪猖獗盘踞。湘西境内沟壑纵横，溪河密布，峰峦起伏，洞穴连绵。有10多个县与鄂、渝、黔、桂四省交界，历朝皆属统治薄弱区域。自宋以来，匪患未绝，清末伊始，匪患猖獗，民国尤烈。众多匪首利用湘西险要的山川形势割据一方，称王称霸。风高放火，月黑杀人，打家劫舍，奸淫掳掠，给湘西人民带来无穷的灾难，使得几百年来风景秀丽湘西被口口相传，称作“中国的盲肠”。湘西土匪相信，无人能肃清湘西匪患，湘西的土匪就像湘西从古至今绵延不绝的溪水一样，永世长存。1949年秋，中国人民解放军某部南下进攻云贵川剿除国民党最后势力，路过湘西。军文工团长梁紫云带领文工团员为即将启程的全军将士献上一场精彩的动员演出后，梁紫云等五名文工团员被土匪神秘掳走，军长震怒之下授命侦察连长郑虎臣直捣匪巢解救文工团员。抗战时跟随乡亲投奔八路军打鬼子保家卫国的郑虎臣，经历了抗战和解放战争十年战火的洗礼，已经从一个少不更事的SFC Perfect, No Found Can't Run Game南方诸侯之中影响比较大，能够起到举足轻重作用的就是越国了。　　8. What Can A Song Do?家电制造商木村电器里不受待见的社员三人组--小林、太田、长井接到大权独揽的社长命令，要求要开发一款时下流行的直立行走机器人。其目的是在即将举行的机器人博览会上为企业做广告。但是，在距离机器人博览会一周的时候，制作中的机器人"新海风"却摔了个七零八落！陷入绝境的三个人于是决定在机器人中放入真人来蒙混过关。为了找寻能够刚好装入机器人外壳的人，三人展开了虚构的试镜，并最终选中了退休独居已久的老人铃木重光（73岁）。但是，没想到铃木是个奇人老头。。。再加上迷恋"新海风"的机器人宅的女学生叶子也被卷了进来，事态朝着预想不到的方向发展起来If an attack is detected, the management center will start a cleaning scheme to pull the mixed traffic of attack traffic and normal traffic through BGP, CDN, etc. Pull the mixed flow to the flow cleaning center for cleaning. The problem in the process of traffic cleaning is that the current DDOS attacks present a mixed attack state with multiple attack methods coexisting. In this case, how to efficiently detect attacks is the main problem currently facing. After consulting numerous data, Huawei's "seven-layer cleaning plan" is found to be very enlightening. The scheme comprehensively analyzes data packets for mixed traffic through seven layers of defense measures such as static filtering, abnormal message filtering, scanning and snooping message filtering, source legitimacy authentication, session-based prevention, feature identification filtering and traffic shaping, so as to detect attack traffic to the greatest extent. The framework of Huawei's "seven-layer cleaning scheme" is shown in Figure 2. After the traffic is cleaned, the attack traffic is discarded, and the normal traffic is injected back into the network through MPLS, GRE tunnel technology, etc.