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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.I have the confidence to mention divorce. It's a big deal to live alone.娃儿们沿途洒下清脆的欢笑，惊起林中暮归的鸟儿，盘旋飞上高空，待人走远，方才落下说着，小草、绿枝、绿叶、绿竹各自抱了个小娃儿，一齐下楼去了。…,徐明和徐宣能够隐忍。“雪花”是世界上唯一的白色的大猩猩，逛动物园的孩子们喜欢它，其他的没那么白的大猩猩们则不以为然，雪花因自己的不正常而苦恼至极。在朋友艾努尔，一头转世在红色熊猫身体里的黑豹以及小女孩宝拉的帮助下，雪花得以逃出动物园去拜访马戏团里的女巫，让她能把自己变成一头正常的大猩猩。可是一旦三位朋友走出了动物园，危险便接踵而至…