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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.'A' * 140 + p32 (write_plt) + p32 (ret) + p32 (1) + p32 (address) + p32 (4)　　李钟硕将加盟朴勋政执导新片[VIP]。故事讲述朝鲜某高官儿子在世界各国连续杀人，韩朝两国警方以及国际刑警对其进行追捕。李钟硕在片中饰演被追捕的连环杀人犯，这也是欧巴首次挑战反派角色。在最新电视剧《W-两个世界》杀青后，他将进入剧组进行拍摄。唐伯虎神情更加严肃认真了，出笔稳而有力，非常小心细致的开始刷鸡翅膀。一群大学生，他们敢于测试城市传说中的任何人，只要穿过一座幽灵般的桥——一个女人曾经在桥上自杀的地方——在m.77午夜密克罗尼西亚联邦会发现邪恶在等着他们。