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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.1. Take MIUI system as an example, click the "Settings" application icon on the desktop of the mobile phone;威震天下三大名捕，有江南佟林，北京“神眼”石铸及闽南“一枝花”林雁儿（化名潘媚娘）。十几年来一直在追捕惊动京师的女飞贼“金燕子”，闻得金燕子在古北口，逐即赶来，并与佟林狭路相逢。雁儿更假扮金燕子，以引出真正金燕子，以得重赏。南宋年间，宋高宗听信秦桧的谗言，以莫须有的罪名杀害岳飞，韩世忠辞官。秦桧结党营私，只手遮天，令亲者痛，仇者快。多名前朝元老聚合民间资源，组成“豪侠”，结合多名武林中奇能异士，与秦桧对抗，但第一笔巨款，在托运时竟然失踪。押运巨款的“豪侠”，全数遇害……等小鱼儿适应了狼狗的难度后，几大恶人开始把小鱼儿和狼、虎等各种猛兽关在一起。搏击王国 第三季　　在汉山市警方的缉毒过程中，线人赵东携带10件7千克海洛因神秘失踪，主管这次行动的龙达因此背负重大责任事故的罪名。此时又有检举龙达贪污受贿的举报信送来，省厅决定委任杨华去调查龙达的问题，并且对曾被检举有重大问题的汉山市仁昌集团进行秘密调查。在杨华找到与仁昌集团有关的证人宋大福进行询问时，宋却突然身亡。龙达被暂时羁押，执行双规。龙达接到赵东砖窑、生命危险的寻呼，无奈之下打倒看守他的史杰，逃出警局。