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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:?Liu Xing, who plays the quaint Liu Xing in "Family with Children", is well known by the audience. The 2016 starring "Yu Zui" has made him popular in the entertainment circle. There is much room for appreciation, sign!来，我教你打炮。文小桃想了想，最后还是红着脸，点点头。　　异能局由一批正义的异能者组成，维护异能世界的平衡，对抗着邪恶组织无限者。无限者为了掌控异能世界，用尽各种阴谋试图夺取异能局中能消除异能副作用的“抑制剂”。庄羽协同异能局众人与无限者展开了一次次奇幻的斗争……　　至此，卡斯特的意识中永远烙上了惩罚的字样，他身着战服，从头到脚都武装起来，其明显标志就是展现在黑衣胸前的那个巨大的白色骷髅头像。在接下来的日子里，他便开始寻找并制裁那些他认为参与杀害他妻儿的相关歹徒。在多次直捣敌营，让罪犯横尸一片后，新闻媒体开始把替天行道、执行黑暗公正的他尊称为惩罚者。Walk 200 kilometers along the border to another village. There was a Kirgiz grandfather who told me that it was not enough to walk along the border to protect the border.