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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.HorseOther methods to modify rules: delete rules by number first, and then add a rule at the original number position.聚焦1977年纽约的一群纳粹猎人，他们发现数百名纳粹高级官员生活在他们当中，正在密谋在美国建立第四帝国。纳粹猎人们将寻求将纳粹绳之以法，阻挠他们新的大屠杀计划。勒曼有望饰演Jonah Heidelbaum，他的祖母在家中被一名神秘的闯入者杀害，他着手追踪犯罪者，却发现自己被卷入一个叫作“纳粹猎人”的组织，他们致力于根除那些用虚假身份生活在美国的纳粹凶手。Target.method1 ();外面，夜风还在吹拂着窗纸，但听起来已不再像是哭泣，而像是远处传来的欢声笑语。