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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.圣人无敌，历万劫而不磨，沾因果而不染，与天常在，与道同存。早晨。/shrug (Shrug)Among them, most unreliable success studies have chosen the wrong practice method. Although the slogan they shout is deliberate practice, the essence is not deliberate practice, because they do not activate long-term memory ability. For example, the number of times you play chess has no effect, and you cannot become a national player for 10 to 10,000 hours. However, if you look at the published chess scores and then speculate on the national players' playing methods, this deliberate practice method is to save SSD hard disks into the long-term memory hard disks: chunks that store the chess scores.0-200When Xiao Bian first came to Nagoya, he chatted and asked a local person, where is Nagoya more fun?