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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.The idea of module mode is to add private variables and private methods to single mode to reduce the use of global variables. The following is the code structure of a module mode:反抗、自由正是《白发魔女传》的主基调。《BiteSisters》讲述了可以将各种风格转化为自身魅力、看到不义之事就无法忍受的韩伊娜(姜汉娜饰)，在一瞬间成为了粉丝百万的网络红人，无意中偷偷帮助那些需要帮助的人，是一部甜蜜奇幻剧。罗马，夏日，一队穿梭其中的游客。这座美得令人窒息的古老城池，正以一种神秘而冷艳的姿态诱惑着他们，让人心甘情愿地被这份精致得令人绝望的美丽所俘获，沉醉其中。然而在捷普·甘巴尔代拉（托尼·瑟维洛 Toni Servillo 饰）眼中，罗马却是一座寂寞之都。65岁的捷普是一名成功记者，风度翩翩、魅力十足。年轻时代撰写的一本文学作品让他在早年就名利双收。他辗转在各样肆意妄为的奢靡与觥筹交错的社交之中，用一双冷酷到几近麻木的双眼，目睹这座绝美之城背后的空虚与隐秘。当女高音的咏叹调再次响起，游走在平民生活与上层社会之间的捷普，开始重拾那些逝去的青春记忆，只有罗马之城仍依旧着她的冷漠与华美，不曾改变。传说中的百人斩万次（木村拓哉 饰），曾经经历了失去妹妹的痛苦，此后失去升至希望的他，被一个神秘的老婆婆赋予了不死之身的能力。可是永世的伴随永恒的痛苦，万次始终不忘寻找终结永恒的机缘。这一日，少女浅野凛（杉咲花 饰）找上门来。原来，凛是无天一流师父的女儿，不久之前，被逐出师门的天津影久率领他的剑客集团对凛的一家展开了残酷的屠杀。为了替家人报仇，凛只得求助万次。在此之后，黑衣鲭人（北村一辉 饰）、乙橘槙绘（户田惠梨香 饰）等剑客集团高手相继袭来。不死万次以一己之力对抗豪强剑客……Is there only one person? ? ) I thought a lot of people would like hiroki.