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Reset authentication takes advantage of the reliability of TCP protocol, and DDOS protection system responds to syn first. When the protective device receives syn, it responds to syn_ack and sets the Acknowledge number to a specific value (recorded as a cookie). When the real client receives this message and finds that the acknowledgement number is incorrect, it will send a reset message with a sequence number of cookie + 1. The source of the forgery will not have any response. In this way, we can add the real client IP to the white list. ?In a recycling point, the reporter saw that from time to time, after someone picked up the express in the express service center, they unpacked and took out the items on the spot and threw the cartons into the recycling box. However, consumers will not open the express on the spot for larger items that are not easy to carry. Therefore, it is difficult to solve the recycling problem of all express packages by relying solely on the recycling desk. Therefore, enterprises have also begun to work hard on packaging materials to promote the use of this environmentally friendly green express packaging. Li Siwei, head of the Cainiao Yizhan in beijing university of chemical technology, said that the green express package is of very good quality and strong strength, and comes with a self-adhesive strip with a very clever design. Its biggest characteristic is that it is degradable and can be reused many times, reducing the use of adhesive tape, eliminating white pollution and having good quality in use.Observer mode: pay attention to encapsulating object notification, support the change of communication object, realize the change of object state, notify and update the objects that depend on it.《天堑·1949》为建党90周年献礼剧，该剧讲述了解放前夕，国共两党进入最后的战略决战阶段，渡江战役打响在即，共产党内线人员和国民党特派组在战略要地斗智斗勇的故事。是有缘故的，听闻越王尹旭和侄女之间似乎有些情意。南柱赫、金泰梨有望主演tvN新剧《二十五 二十一》。该剧由郑志贤(《国王：永远的君主》)执导，权度恩(《请输入搜索词：WWW》)操刀剧本，讲述1998-2021年间的故事，1998年22岁和18岁的两位主人公相遇，到了1999年时两人开始互相伤害，2000年时两人开始互相依靠，直到2001年两人才开始一段恋情。两年前，我国特种兵郭阳成功诱导T国毒王进入我国边境线进行抓捕，行动中郭阳因队长死亡患创伤后应激障碍退伍。