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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.Of the above three stages, the attack is undoubtedly the most important one. For DDOS attacks, when the attack occurs, the best defense measure is to quickly filter the attack packets on the premise of early detection of the attack to ensure the access of legitimate users. At present, for DDOS attacks, security companies mainly adopt traffic cleaning methods. A common flow cleaning architecture is shown in Figure 1.李晨光是90后阳光帅气的大男孩，是某大型企业的总经理，有一位漂亮的老婆，她叫何佳美；何佳美貌美如花深爱着李晨光，何佳美有个无血缘关系的哥哥，也深爱着何佳美。平静的生活中，李晨光的身边出现了一名叫罗小曼的女人，何佳美怀疑老公对自己不忠心，雇佣侦探社老板，把故事的剧情引到了高潮，车祸、鬼娃、恐吓、步步紧逼……事讲述了一只古怪、快乐、热情的兔子 Molang，和一只害羞、谨慎、情绪化的小鸡 Piu Piu 之间的关系，这个动画系列剧用非常温暖的方式探索了 Molang 和 Piu Piu 的日常生活。在那个丈夫是天的年代里，女人的生存是一道奇特的风景线，她们没有欲望，没有思想，没有女人应该拥有的一切，所以只能默默地承受，默默地流泪，等到眼泪熬干了，春天也就过去了。《胭脂雪》故事讲述的就是这样七个女人，美丽与挣扎，阴谋与爱情，还有贞节牌坊背后隐藏的秘密，串起了一幕幕动人的悲欢离合。那些凄然的生命，宛如一道瞬间消融的胭脂雪，或苦苦地等，或惨惨地死，或在满天花雨中悄然期盼，缘起，缘灭……民国初年，江南某镇。大婚前夕白依玲的丈夫病亡，她被父亲烙伤容貌送入辜家为丈夫守节，从此渺无音讯。夏云开为了恋人白依玲来到辜家，以自己的能力赢得了辜家大少奶奶宁默心的赏识，当上了辜家的管家，开始了暗中找寻恋人的行动。镇上文家的小姐文玉禾，由于不满父亲生意失败将其作为筹码嫁到辜家而逃婚，却因为夏云开的出现而失败，而两人的情感纠葛也由此展开。玉禾嫁入辜家，恍如置身一个神秘的陌生地——不学无术的丈夫少棠，老谋深算的婆婆李氏，声色俱厉的寡嫂默心，神出鬼没的小姑守贞以及小人得志的丫鬟阿桃，还有各种诡异的传说和永远封着门命运是一个大转轮，无论它去得多远，行得多久，终会回到原点。哼，依我，也不必等你回去报信，直接就把公主一刀杀了省事，反正老将军已经安排妥当。