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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.这什么军啊。4. Large investment, The density is too high when the water supply is not available, Misgurnus anguillicaudatus invested about 500 kg, Monopterus albus invested about 100 kg, and snails invested about 3,000 kg. These items were basically not sold back at all. The workers hired two, 6,000 a month. The reason was that they were too optimistic about the prospect, the workers did not pay attention, and they basically had to worry about themselves. Therefore, the breeding should be done slowly by their own family as far as possible, and people should be hired when the scale went up.就没想到你们连衣裳都没有。4 奇迹之女Ensure good communication and create a professional discussion atmosphere;