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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.6. A photocopy of the Notice of Approval for Enterprise Information Change issued by the Administration for Industry and Commerce and stamped with the official seal (three certificates need not be provided in one)《孔子》:讲述的是留学美国的女学生梅燕,为完成一部研究孔子的博士论文,回到中国,由此展开本剧故事的两条线索:A,孔子的生平及其主要思想；B,在研究孔子的过程中,梅燕身边所发生的当代生活的方方面面,以及对孔子精神的思考.In this blog, from theory to practice, the system introduces iptables. If you want to know iptables from scratch, you can check the list of iptables articles, and the direct link is as follows.In addition to various attack methods, DDOS attacks often use false source IP, which is also one of the reasons why DDOS attacks are difficult to defend.艾瑞克·巴纳加盟澳大利亚新片[小镇缉凶](TheDry，暂译)。影片改编自简·哈珀同名畅销小说，罗伯特·康诺利(《深暗势力》)自编自导，巴纳、康诺利共同担任监制。影片围绕一个警察回到老家侦破凶案展开，明年二月开机。这也是巴纳自2007年的[我的父亲,罗穆卢斯]后再度拍摄澳大利亚影片。《镜文学惊悚剧场》集合了卓立、陈宏一、王威翔、刘邦耀、林冠甫、沉骐、李育丞7位导演，联手制作7部不同内容，但都紧紧扣着惊悚悬疑的故事。你看见的，不一定是你看见的。七个故事，窥探人性的幽暗深渊。《乐园》夫妻共赴神秘度假村，为了拯救爱情却救不了命《肇事者逃逸》设法逃出死亡回圈的求生罗生门《住户公约第一条》孤独孩童的家庭秘密，竟是一桩痛心惨剧《打扫》吞噬人的黑洞，是源自人性受倾轧而诱发的疯癫《虎》的挑衅、忌妒与占有，终将酿起残酷的复仇《隧道》追寻救赎而激荡出的爱，沾染毁灭的气味《完美Lily》对美好人生的向往，却是复制与贴上