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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.HBO宣布Augustine Frizzell将会执导少年题材剧《亢奋 Euphoria》，该项目根据以色列剧所改编，被形容为如把《半熟少年 Kids》及《猜火车 Trainspotting》的融合般。ダジャレ禁止令 小野武彦 並樹史朗由泰星March、Baifern、Dan等明星主演泰剧《沙粒公主》，该剧讲述了三角恋的故事。问及尹旭，许负只道此人福祸相依，说不定也会大富大贵。One of the most shocking attempts to weaponize user feedback we witnessed in 2017 was a group of 4Chan users who decided to undermine CNN's ranking in the App Store by leaving thousands of 1-star ratings.OnTouchEvent () for ViewGroup2 consumes the down event, other defaults.