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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:?客轮“极光号”神秘地撞上了多岩石的大海，威胁到整个岛屿和一名年轻女子及其姐妹的生命，她们必须通过寻找失踪的尸体以获得赏金来生存，同时也面临着在家中寻求庇护的游客的危险这话可不能对汉人讲。几人行至操场，军士送来三支沥海产的燧发铳，杨长帆就此拿来，送到戚继光和赵文华手里。在三十年代的上海，代号“灵猫”的我党上海某地下情报站成员乔山奋战在隐秘战线：先是在情报站成员古方仁、古文雅等的配合下，借助日特犬养浩对龙门的觊觎，赢得了龙门老大龙浦生的信任，在龙门站稳脚跟。后受命打入军统，利用国民党中央组织部党务调查科徐显文和力行社特务处郑博群之间的矛盾，斡旋在龙门帮、国民党和日特机关之间，使其彼此牵制，成功救治我军重要领导人。同时他还与叛徒周家坤斗智斗勇，保卫我党在上海的秘密组织、查清和惩治了叛徒。最终，在妻子龙宝宝和“亦敌亦友”的许东城同志暗中帮助下，乔山冲破重重封锁，历经九次生死考验，为苏区输送急需的军火和药品，为保卫党组织安全，支援苏区反“围剿”斗争以及全国的解放立下了特殊功勋。//Register multiple delegates for the eventAdd the following code to "TestSpring":