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The firewall sets the SYN forwarding timeout parameter (the firewall for state detection can be set in the state table), which is much less than the timeout time of the server. When the client sends the SYN packet and the server sends the acknowledgement packet (SYN + ACK), if the firewall has not received the acknowledgement packet (ACK) from the client by the time the counter expires, it sends the RST packet to the server to cause the server to delete the half connection from the queue. It is worth noting that the setting of gateway timeout parameters should not be too small or too large. If the setting of timeout parameters is too small, it will affect normal communication. If the setting is too large, it will also affect the effect of preventing SYN attacks. This parameter must be set according to the network application environment.尹旭摇头道：目光放得长远一些，在江东或许用不上，短时间内或许用不上。If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.一对十年前在华盛顿联邦银行遭窃而始终下落不明的美金模板，引发澳门黑白两道在回归前的一场世纪末日决战……　　自力（古天乐饰）与生父（刘兆铭饰）重遇后，本来打算与田宁（蔡少芬饰）长厢斯守，可惜，田宁失忆后，竟决定和志强（郭晋安饰）结婚……抗战期间，日寇成立汉奸武装，对抗日根据地进行蚕食、破坏和袭扰并暗杀我地方干部。一天，在迎亲的队伍中，化妆的日伪军杀害我方骨干队员，引起强烈民愤。为严惩汉奸暴行，一支叱咤风云的敌后便衣队从此活跃在淮北大地上，在执行反特锄奸，敌后侦察，拔除据点，内线策反，武装打击日伪土顽势力，深入敌营惩办叛徒恶霸匪首等特殊而艰巨的任务过程中，大队长陈忠华老成持重，政委贺兰刚柔相济，关涛刚烈勇猛而内心情感丰富，不同个性的新四军战士组成了一个威震敌胆的英雄群体，成为一群红色传奇人物。Console.log (application. A); //aa