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Reflection attack is also called amplification attack. This kind of attack is mainly based on UDP protocol. Common attack types include NTP, DNS, etc. Generally, the traffic of request response is much larger than the traffic of request itself. Attackers can create large-scale traffic sources with small traffic bandwidth through the characteristic that traffic is enlarged, thus launching attacks on targets. Reflective attacks are not strictly a kind of attacks. They only use the business characteristics of certain services to launch Flood attacks at a lower cost. The detailed schematic diagram is as follows:Liu Guiduo sat on the deck and looked frustrated.(1) Two vertical mast lights to replace the lights specified in Article 23, paragraph 1 (1) or paragraph 1 (2). When the towing length from the stern of the tugboat to the rear end of the towed object exceeds 200m, three such lights are vertically displayed;你们说，谁会赢？有人不禁问道。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.