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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.Invoice Description: Electronic invoice (general invoice) will be issued by default and sent to e-mail within about 1 month.1. Columns of command modePublic User (Mediator mediator) {该剧是讲述既不是检察官也不是律师或侦探，而是国家人权委员会的调查官们的故事，将描写既没有搜查权也没有起诉权的调查官为了被侵害人权而感到绝望的人们而奔走的姿态。主角们调查着比既有的人权侵害和歧视等陈情更重要的陈情案，负责受害程度严重、引起社会性争议、因为公权力、组织、机关等引发的人权侵害问题的调查事宜。