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If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.圆圆、无限、子成及玫心一起在乡下的孤儿院长大，他们是名符其实的一无所有，只拥有彼此，他们自称是『圆圆帮』。 十八岁那一年，圆圆和无限考上了台北的大学，而子成虽然不会念书，但他亟欲挣脱枷锁，决定随著无限和圆圆到台北闯天下。玫心则是决定嫁给乡下的养猪小开阿明，把家庭当作她离开孤儿院后的人生下一站。 圆圆的班级举办了跨校机车联谊，认识了有钱公子哥志浩，并成了一对恋人，看著志浩整天送爱的礼物，圆圆拥有了这些『理所当然』，但这都是无限给不起的。 念工业设计的开销颇大，无限把课餘时间都拿去打工，他没能力像志浩这般呵护圆圆，於是就算没人看好，经歷冷言冷语也动摇不了的玩具设计师梦想，终是被动摇了。第二天，无限办了休学，跟子成借钱报名重考班。 只是，当他兴冲冲地在圆圆面前宣布自己要放弃设计转当医生，还忍不住暗示圆圆，一毕业他就可以领多少钱时，圆圆却一脸豁达地宣布… 『我绝对不会再爱上任何人了！』《佳期如梦》是一部根据匪我思存同名小说改编，由上海创翊文化公司、湖南经视和浙江华策共同投拍，邀陈乔恩、邱泽、冯绍峰等领衔主演的都市情感偶像剧。那该如何是好？徐阶起先对皇上毕恭毕敬，唯唯诺诺，狐尾尽藏，为今其心渐显，皇上要再修仙坛，请道士，皆被徐阶劝止，皇上必是怀恨在心，只是赶走严首辅的是他，请来徐阶的也是他，依您父亲所言，皇上极好面子，永远不会承认判断有误，因此不好发作。这天早晨八点多钟的时候，文小桃一路小跑，回到宿舍。The full name of UDP protocol is user datagram protocol. It is used to process data packets like TCP protocol in the network and is a connectionless protocol. In the OSI model, the fourth layer, the transport layer, is the next layer above the IP protocol. UDP has the disadvantages of not providing packet grouping, assembling and sorting packets, that is, when the message is sent, it is impossible to know whether it arrives safely and completely.6. Memorandum modalities