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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.石金河、石银河两兄弟出生在偏远贫苦的山区石门掌。由于家境贫寒，父亲石罗锅只好用抓阄来决定两兄弟的前程。哥哥石金河得以念完中学，并考取了大学；弟弟石银河却只能在家种田，与父亲共同肩负供养金河上学的重担。转眼间，金河即将毕业，他努力地寻找工作，想在城市中闯出一片属于自己的天；而银河也不甘心一辈子在乡下，进城打工赚钱，在一个饲料厂当搬运工人。乡下的父亲催促着大儿子回家相亲，金河拒绝回乡，他发誓要变成一个城市人，再不要遭人白眼、被人歧视。由于金河执意不回，石罗锅和媒人七姑合计来了个移花接木，让银河代替金河去相亲。没想到，老实的银河自己就戳穿了父亲和媒人设下的骗局，也正是由于他的坦诚，赢得了姑娘柳莺莺的芳心。金河其实早已经有了心上人，是与他同班的温小寒。温小寒和金河同样面临留城和找工作的困难。由于现实的残酷，现实的温小寒接受了高干子弟，班长陈尔东的帮助，并决定嫁给他，进入豪门。这让金河难以接受。学校附近的小餐馆服务员—同是从乡下进城打工的高马丽却十分崇拜金河这个大学生，金河在小饭馆打工的期间处处照该剧将以韩国智异山为背景，讲述在大雨、大雪、滑坡、台风天气下，智异山国家公园的护林员救出被困者，并在直升机无法起飞的一天，在5小时内，救出了被困者。全智贤将饰演智异山国家公园最好的护林员。不过，顾小玉对陈启还是蛮有信心的，就算变成言情小说，相信老板也能带给大家一部精彩的言情小说，虽然言情小说有多精彩。难道是燕王臧荼请自己前去？想要出谋划策抵御韩信的进攻？虽然自己是范阳人，可是这个时代国家的概念似乎有些模糊，尤其是在乱世之中寻求发展的有志之士，更是良禽择木而栖，张良不就是个很好的例子嘛。黄豆捂着头嘻嘻笑道：我说他们就是想不开：那些东西留不长，费那个劲干啥？你问紫茄，可是坏了许多，都捡出来扔了。The real limiting factor for a single attacker who uses spoofing attacks is that if these spoofed packets can be traced back to their real addresses in some way, the attacker will be simply defeated. Although the backtracking process requires some time and cooperation between ISPs, it is not impossible. However, it will be more difficult to prevent distributed SYN flooding attacks launched by attackers using the advantage of the number of hosts in the network. As shown in FIG. 3, these host groups can use direct attacks or further let each host use spoofing attacks.