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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.2. Attribute vulnerability location is attacked by vulnerability attributeIn women, they often spend more time reviewing their lives, especially enumerating those regrets in their lives.他们的故事以悲剧告终，但是他们之间已经有了某种联系，甚至在他们死后也将他们绑在一起。In addition to half a day off, working women also have these exclusive rights and interests!　　胡雪岩以杭州经营的钱庄为本业，发迹后扩展粮食买卖、房地产、典当和中药行等事业。其中主要以在各省设有二十多个支店的“阜