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小葱才放下心来。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."Bus and subway all-pass one-day ticket"范白续道：项梁元帅处境艰难，向四方发出救援信函，除了陈王旧部吕臣将军,再无一人前往。(3) If the length exceeds 100m, add a number of ring-illuminated white lights between the lights specified in items (1) and (2) so that the distance between these lights does not exceed 100m;Chapter IV Sound and Light Signals