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When the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.1949年秋冬之交,风雨飘摇的成都，彭刚、吴佩欣和女儿豆豆的幸福三口之家迎来了危机。两口子曾共赴国难，在抗战前线并肩杀敌，危急关头结下生死情缘而成为夫妻。谁知抗战胜利后随即转入内战，彭刚五内俱焚，因为他曾经是一名共产党员，他不能把枪口对准自己的同志，所以他乔装颓废，以一副不思进取的状态退居人后。成都解放在即的紧要关头，彭刚被党组织发现，他立即行动起来。谁知自己的变化引起妻子的怀疑，吴佩欣如梦惊醒，共枕多年换来的却是同床异梦，她害怕失去丈夫，害怕失去家庭，于是她由暗中监视彭刚，到精心设置圈套干扰彭刚所有的作为，甚至切断他与外界的一切联系。蒙在鼓里的彭刚对此浑然不知，他一往无前地投入到组织所赋予自己的任务中，冒着生命危险，化解种种障碍，殊死奋战，用生命捍卫了自己的使命和信仰，迎来成都的解放[该部影片是以中国人民解放军三十军，以一个军兵力全歼蒋军一个军加一个师的真实历史题材，展现了老一代革命家大智大勇解放上海战役的宏大历史画卷，对今人具有极大的爱国主义教育意义……在这部未来惊悚片，世界成为一片冰冻的荒芜之地。残存的人类居住在一列巨型列车上，永无止尽地绕行全球。不得不说尹旭的运气着实不错，有幸遇到这许多忠心不二的人才TreeNode nodeB = new TreeNode ("B");Since V's damage is multi-segment and has a delay (there will be damage after the rockfall animation is over, you can take a closer look at it when V is a small soldier), T's function is equivalent to allowing the throwing target to enter the damage area of V for the second time, making the target enter the damage area before the damage calculation is over, so there will be a second V's damage. It is often called VTV.