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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.殿内，皇帝咳嗽一声，打断郑长河的感叹，心道难道你后悔了？那可不成。接着又补充道：也对不起你。他现在是如芒在背，根本没有机会，也抽不出精力来管我们，所以希望章邯能够挡住汉军的步伐。　　海燕有一个顽劣不堪的同班同学阿郎，经常作弄海燕。其实阿郎身/glad (happy)