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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. The end result is that the server has no time to ignore the normal connection request-denial of service. If you look at the SYN_RECV status on the server with the netstat-an command, you can see that there are a large number of connection states that are "SYN_RECEIVED"Traditional security is a constant stack of security devices, security products, Later, in order to make better use of these secure infrastructure resources, Defence-in-depth emerged, Take the layer as an example, Layer by layer, Defense from the outside to the inside, However, security problems emerge one after another. It also shows that this still cannot well ensure the safety of the organization. Safety is a growing problem, which cannot be solved by one-time deployment. Safety problems not only come from external and internal damages, but also are not rare intentionally or unintentionally. Therefore, the focus should be on sparse, starting from three aspects: detection, emergency response and process.徐宣也从容道：不错，姒摇大人，我们徐家的船运以及很多的外部势力暂时还在我的手中。However, in the actual use process, Rules are often defined through "tables" as operators. The reason why iptables are introduced according to the above process is that it is easier to understand them from the perspective of "checkpoints" and from the perspective of entry. However, in order to understand them more smoothly in actual use, we also list the relationship between each "table" and "chain" here.该剧是一部不恋爱，是不结婚，非常现实、关于家庭意义的温暖故事。在首都塔拉古纳，有一群被称之为“宠物”的低等居民。他们被豢养、玩弄，每天都生活在没有尊严的纸醉金迷中。里奇（关俊彦 配音）就是其中的一员，但也是特殊的一员，黑发的他属于底层居民，而他金发的主人雷森（盐泽兼人 配音）却是朱庇特最喜欢的“孩子”。其实，他们的感情早已远远超出了正常的宠物与主人之间的界限，然而，在朱庇特看来，这样跨越阶级和种族的感情是绝对不允许发生的。这一对禁断的恋人会有一个好的结果吗？在绝对的统治之下，所有的一切都显得那样渺小。Pop ebx; Pop esi; Pop ebp; Ret