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Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.故事从少女辻泽梁香（广濑铃 饰）与老婆婆林田亚乃音（田中裕子 饰）相遇开始，梁香失去家人，与社会脱节，找不到生存下去的方法，两颗遭遇背叛、欺骗，无法相信他人的心碰到一起，萌生出了某种感情，亚乃音努力保护梁香，假的家庭，假的人生，假的记忆，还有真实发生的事件，让少女逐渐发生改变……Is it TCP to try to send enough SYN packets and run out of backlog? The purpose of SYN flooding. The attacker added the source IP address to the SYN packet, which would not cause the host to remove the assigned TCB from the SYN-RECEVIED state queue (because the host would respond to the SYN-ACK). Because TCP is reliable, the destination host will wait quite a long time before disconnecting the half-open connection and removing the TCB from the SYN-RECIEVED queue. During this period, the server will not be able to respond to legitimate new TCP connection requests from other applications. Figure 2 shows a simple TCP? The process of a SYN flooding attack.珊瑚摇头道：苞谷哥哥从来不欺负我，对我可好了。杨长帆拿起了绳尺一头，到四丈你喊我停，我插竹竿。五百年前，曾经出现过一场惊心动魂的人僵大战，一众明朝锦衣卫力战不明来历、杀人如麻的僵尸。其时战况何其激烈，外人不得而知，但重要的是，当年多位奋不顾身的宫中高手，竟然活到现在……A3 is an object pointer to Tank and should inherit IntervalTimer, which is independent of confrontation and battle, so there is also a control system similar to confrontation in battle.