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Synflood attack is the most common DDoS attack on the current network, It is also the most classic denial of service attack. It takes advantage of a defect in the implementation of TCP protocol. By sending a large number of attack messages with forged source addresses to the ports where the network service is located, it may cause the half-open connection queue in the target server to be full, thus preventing other legitimate users from accessing.Responsibility chain mode-A request needs multiple objects to process, thus avoiding the coupling relationship between the sender and receiver of the request. Connect these objects into a chain and pass the request along this chain until an object processes it. The specific structure diagram is as follows:连天的弩箭，以及尹旭吩咐连夜赶制的简易抛石机，对铜山本就薄弱的土城墙造成了严重破坏，已经多次发生坍塌，好在修补及时，城池并未攻破。然后，某一天出海时，宝石国的驸马就消失无踪了，据说是被海盗掳去了，驸马的老爹也呼天抢地地跳了海。