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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.Manaca, to put it bluntly, is a subway card. By charging money into the card, you only need to swipe your card when entering or leaving the subway, and you don't need to buy a ticket. In addition, the vending machine in the subway can also use Manaca credit card to pay, which is very convenient.It is strongly recommended that the entertainment circle article "Perfect Relationship"-Xi He Clear, which is super sweet, warm and touching.《真爱遇到他》（原名：《上流俗女》），是由浙江华策影视股份有限公司、GTV八大电视台出品，台湾著名导演柯翰辰执导的一部青春浪漫爱情偶像剧，由安以轩、贺军翔、付辛博、弦子、信领衔主演，讲述了一个南部养猪大户的千金，和一个来自北部的企业小开两人因误会坠入情网的爱情故事。本剧将于2014年07月06日登陆浙江卫视、中国蓝剧场全国独家上映播出。KnowingLawyer Yi talked about a case he had done:Earlier in the day of the press conference, Cohen accused Trump of being a "racist", "hypocrite" and "liar" at a congressional hearing broadcast live across the United States. The "collusion" between Trump and Russia was publicly disclosed. Show evidence that Trump paid "hush money" to porn stars, etc.