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尤其是赵翔，他可是从未到过乡下的。So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.该剧讲述的是发生在不远的未来，交织于网络虚拟世界和现实世界的故事，它集惊险、警匪、侦破、言情于一身。公元2035年，有线、无线宽带网络融为一体，覆盖整个地球。早在20世纪末期，虚拟现实就出现在电脑游戏中，“有机分子电脑芯片”和“大脑传感器”的研究成功，使整个互联网完全实现虚拟化。人们在虚拟世界里可以看到、听到、嗅到、感觉到由数字程序设定的一切，一个全球范围内有秩序的网络虚拟世界已经与现实世界并行存在。“虚拟生活”已经成为人们生活中不可或缺的一个重要部分……Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.该剧主要讲述一对在办公室分属不同阵营的夫妇，为了获取各自上司的信任而选择瞒婚并因此而经历了感情波折的故。把规矩定严谨些，出了事就按规矩办，你们管事也轻省好多。