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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.For the new retail, Osaka Weaving House "all in" has also maintained its consistent caution. This brand, which is good at offline, said when looking online, "We cannot forget offline thinking and ways."　任时完将牵手林允儿 ，出演古装韩剧《王之爱》，上演美少年高丽王和美少女富家女的浪漫爱情史剧。 　　任时完在剧中饰演如芍药一般魅惑的美少年，虽然外人看起来是美丽而善良的，但实际上却是一个隐藏着扭曲征服欲的高丽世子。林允儿饰演因为美丽的外貌吸引两个男人的视线，但却从不掩饰的用种种手段和方法破坏他们的关系，变身高丽版郝思嘉。(郝思嘉，著名小说《飘》女主角。漂亮、聪明、又性格倔强，特别能吸引周围男子的目光)。该剧为MBC精心准备的野心之作，预计明年年初与观众们见面。　　第一季中，被遗弃的太空飞船刀锋上的六个船员们从冬眠状态中醒来，他们不记得自己是谁，也不记得是如何上船的。在旅途中，他们相继知晓了自己的真实身份和过往生活，整个过程危机四伏，陷阱重重，看似和谐的表象下充满着复仇、秘密与猜忌。最后，出人意料的是，六号出卖了大家，星际委员带走了晕倒的五人。李敬文心中一惊：他可不就是因为这个来的么。阎锡山主持“清东陵文物展览会”宣布委任那辛为保护文物全国委员会会长。会后，阎锡山命将珍宝登记装箱，派于跃先押送到保文会。溥仪得知后，万分气愤。日本人则说“明取不如暗夺”。不久传闻说保文会被洗劫一空。法庭上，那辛被指控勾结土匪盗宝。为证实真假，那辛在监督下开箱查验。封条未动的珍宝箱内竟然是一堆破砖烂瓦。那辛惊呆了。至此，那辛被推上了被告席，而真正的祸首却逍遥法外。