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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.皇帝被囚、宫廷内乱，明枪暗箭 一番龙争虎斗。Disney+将开发一部关于篮球运动员扬尼斯·阿德托昆博的影片[希腊怪物](Greek Freak，暂译)。该片由阿拉什·阿梅尔([私人战争])操刀剧本，故事将围绕扬尼斯的早期生活及职业现状展开。扬尼斯为尼日利亚裔希腊籍篮球运动员，绰号为“希腊怪物”，司职大前锋，现效力于NBA的密尔沃基雄鹿队。1994年 ルパン三世燃えよ斩鉄剣 燃烧的斩铁剑More Excel/Word/PPT tutorialsAttack speed bonus is the next line of attacks per second in the panel details.