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The principle is that syn messages are first responded to syn_ack by DDOS protection system. With a specific sequence number (recorded as a cookie). The real client returns an ack and the Acknowledge number is cookie+1. The fake client will not respond. In this way, we can know that the clients corresponding to those IP are real and add the real client IP to the white list. The next access passes directly, while other forged syn messages are intercepted. The following is a schematic diagram of protection:?《上道》是由捷成世纪文化产业集团有限公司、捷成瑞吉祥影视传媒有限公司、捷成星纪元影视文化传媒有限公司出品，向佐、贡米、唐晓天、洪浚嘉、涂黎曼、张南主演的科幻剧。3. When they meet each other in narrow waterways or waterways:老胡被抓着透不过气，哀求道：将军，先放下我成不。上古之初，蜀山率众入世除魔，最终将炽鲲魔君围困于北海，长风无忌以肉身为阵，击败魔君，只留一丝魂魄，蜀山掌门长眉重铸其肉身，命弟子沈熠将其带离蜀山，因参与屠龙之战而转生的沈秀，为寻爷爷沈熠复生之机，而引魔龙觉醒，将再次与魔龙决战于北海。调动对汉王最忠诚的亲兵严密护卫王府。我们家的女娃才没那么娇气。