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The attacker actively optimizes the attack to ensure that the detection rate of the classifier is minimized.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.　　Justin Hartley 扮演Kevin, 一个英俊且当红的电视演员，有着异常无趣没有终期的单身生活。是是是……我就是很好奇，神仙是怎么显灵的。在上海这个东方大都市，各类广告公司多如牛毛。3A广告公司就是其中的一家新兴的公司，虽然公司的规模不大，但它却真实的折射出了都市生活的斑斓色彩。讲述了一个独身男人高木护在好友去世之后帮他照顾一对双胞胎子女的故事。芦田爱菜饰演双胞胎中的姐姐薰，性格非常开朗，很会照顾弟弟，阿部贞夫在剧中饰演独身男人高木护，他被双胞胎故意叫成高护木，而且他们家还有一个秘密，养着一条会说话的狗狗，该剧主要讲述了这三个人和神奇狗狗从陌生逐渐变成真正的一家人的故事，是一部温情又感人的家庭剧。　　继《暗算》之后，改编自麦家同名小说的第二部电视剧《在刀尖上行走》