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大苞谷瞪着眼睛，也不知对黛丝和嘉里叽里呱啦说了些什么，两人就都不吱声了。千年前，由天界灵树奇雨果幻化成人的道清，遇到青蛇来此修仙，二人日渐情深。道清逆天而行将奇雨果渡给青蛇，助她化为鲛，自己堕入轮回之劫。数百年间，执念深重的青蛇不断寻找道清转世，欲解开心上人的生死劫。老鳖大咧咧地对小葱笑道。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.无形的界线第一季……《白发魔女传》就在那里，只要眼睛没有瞎的人都会知道这是一部优秀精彩的小说。In fact, we also need to pay attention to one thing, Because when a packet passes through a chain, All the rules of the current chain are matched, However, there must always be an order when matching. We should match one by one, and we said that rules of the same functional type will gather in a "table". Then, which rules in the "table" will be executed at the front of the "chain"? At this time, there needs to be a priority problem. We also take prerouting "chain" as an illustration.