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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.潜过两道围墙，一处小花园边的跨院所在，陡然间多出很多魏国守卫。《十荒六梦之初恋》分别通过影视二创讲述了剧中人物新的故事，龚俊与戚砚笛的温柔陷阱，王一博与宣璐的猫鼠游戏，剧已完结剧中人还在，二创之后赋予其新的感动与温暖，所有都未完待续，传递一个存在于剧之外的新生故事。当然了还涉及到楚怀王，因此都说的很委婉，尹旭想起那日定王号的事情，思维转的飞快，与身边的英布低声迅速交换个意见。　　韩铁匠祖传的青龙刀不幸落入日寇手中,韩铁匠舍身护刀,与宝刀同归于尽。临终留下遗言,希望徒弟们团结一心,共同打出宝刀,报效国家。When x=3, ViewGroup2 has already blocked the event when x=3. Why did MyView still receive an event? If the action value of this event received by MyView is printed out with log, it is found to be ACTION_CANCEL, which indicates that this event has ended for non-human reasons. Let me give an example of the ACTION_CANCEL event. Generally, when we handle the event, we will record something in the down event and then clear the record in the up event. If you have a Button in ListView, When we hold down the Button, the button receives the down event. At this moment, the finger starts to slide, and the event will be intercepted by ListView. At this time, the button will never receive the up event again. However, when ListView intercepts the event, the button will receive the cancel event, indicating that the event is ended for non-human reasons. Therefore, Cancel can do what the up event wants to do at this time.