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.? ? The rhythm philosophy method, with this method to cultivate their own habit of concentration, when the body adapts to a habit, do this thing becomes natural. In other words: scarce concentration can be cultivated through our own efforts. Once this concentration is formed, we will become the envy of our childhood.? ? ? ? ---Failed, hint does not match docker-io version(three) the summary table of the registered fire engineers, the qualification certificate of the registered fire engineers and the photocopies of their social insurance certificates and identity cards;Recommended stars:Hulu 6集限定剧《第二十二条军规 Catch-22》定于美国时间5月17日全季上线，该剧由Paramount Television及Anonymous Content制片，根据Joseph Heller的同名小说改编，George Clooney﹑Grant Heslov及Ellen Kuras各执导两集。
