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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.那你说个容易的，吃的太难了。1989年，在利物浦和诺丁汉森林队的足总杯半决赛中，安妮·威廉姆斯失去了15岁的儿子凯文，她为这场悲剧的真相而战。安妮和其他在比赛中失去孩子的父母站在一起，拒绝相信官方的调查结果，她在不懈地寻求正义的过程中寻找自己的证据。在一个以昆虫为主的后世界末日的废墟中，一只有感知力的蟑螂发现了被遗忘的《氰化欢乐秀》VHS录像带，从而揭开了最疯狂的一季。本季将在一个满是古怪角色的荒谬宇宙中，探索大家都在问的问题，以及一些无人问津的问题