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Iptables Zero Base Quick Start SeriesStart the computer!山芋从偏厅冲出来喊道：快来吃饭。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.孙小傲（王一鸣饰）是个古灵精怪的淘气包。爸爸孙建业（张嘉译饰）和妈妈孙美丽（江珊饰）在俄罗斯工作，小傲一直由耳聋寡言的爷爷孙仲谋（范伟饰）照顾。假期将至，爷爷生病住进医院。一直渴望父母关爱的小傲的生日聚会再次被爸爸以工作为由爽约，愤怒的小傲忍无可忍离家出走。半路上小傲意外地发现搬家车里藏着的小女孩兰兰（肖逾榛饰）。小傲用弹弓将兰兰从追踪她的笨贼手中救出，得知兰兰原来是被犯罪团伙利用的小乞丐。兰兰想要逃离犯罪团伙，回到家乡去寻找宝藏、闯荡世界。无处可去的小傲顿时来了兴致，执意与她同行。兰兰勉强答应，两个愤怒的小孩踏上了离家和归家的旅途……