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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.Combined with all the above descriptions, we can summarize the process of data packets passing through the firewall as follows:The second level of otolaryngology should check the health of hearing, smell, teeth, oral cavity, etc., and the elimination rate is not low. Even if only one tooth has been repaired, it is very difficult to pass.尤其是后来嬴政登基之后的一系列表现，让我们相信秦国最有一统天下的实力。本剧以经营葬仪社的费雪家族(Fisher)为重心，描述每个家族成员在父亲死亡之后的生活。故事的场景主要设定在现代的洛杉矶。此剧可能是第一部把死亡当做主要话题的美剧。[1]In the above story, it can be seen that it is a typical publishing and subscribing mode. The seller belongs to the publisher, and Xiao Hong and Xiao Ming belong to the subscriber. Subscribe to the store. As the publisher, the seller will notify Xiao Ming and Xiao Hong in turn when the shoes arrive, and use Wang Wang and other tools to publish news to them in turn.