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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.为了引起家人的注意，一个过度劳累的母亲，向他们谎报自己的病情。　　天兵二号吴勇(夏政峰饰演)，爱唱歌跳街舞，是个疯狂爱当兵的原住民，他最喜欢看报告班长电影，所以入伍当兵前，早就照电影情节做足功课与万全准备，那知到了部队才发现，真实的当兵生活好像和电影不大一样……④ SENTINEL get-master-addr-by-name杨长帆屏息道，已经快看不到他们了，出林子吧，缓慢接近，等我命令。3, color difference, convenient dribbling, can better grasp the shooting point and shooting point;