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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.According to the memory of Zhang Xiaobo, a soldier who personally participated in the battle that year:# ndd-set/dev/tcp tcp_syn_rcvd_max 2048张正英自知这是一段没有结果的感情，便怂恿蒲地流与同村的刘家女儿翠翠相好，蒲地流与刘翠翠果然一见钟情，便私定了终身。就在蒲地流去县城读书受训的时候，刘翠翠为抗拒父母媒约，新婚之夜上吊自尽，匆匆赶回来的蒲地流只看到了一抔土坟，而就在蒲地流坟前伤心之时，竟意外救下了一名被土匪追赶的红军干部，蒲地流第一次知道中国有一支为穷苦百姓打天下而英勇奋战的军队叫红军。都市生活剧——我从不因被曲解改变初衷，不因冷落而怀疑信念，亦不因年迈而放慢脚步跨越时空的爱情在此过程中产生……