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Incomprehensible　　机敏聪慧的寇老西儿在各方势力包围之下，以其特有的方式逼近了事实的真相…… ©豆瓣When the server provides some UDP-based services, such as DNS, SMTP, NTP, etc., and finds some requests, in which the Response message is larger than the Request message, the Attacker sends a Request message that forges the source IP, and the source IP forges the IP address of the victim. After receiving the Request message, the server replies the "enlarged" Response message to the victim, thus realizing the amplification of traffic. The principle is roughly as follows:Aircraft endorsement requires two years of valid ATP (both airline license) written examination results, and then participate in the initial modification, which means determining the aircraft you will fly in the future, Boeing or Airbus, 737 or 747, etc.4. If no receiver processes the request, the request will leave the chain.