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If a TCP connection is established between A and server B, then C forges an RST packet and sends it to B, causing B to abnormally disconnect the TCP connection with A, which is an RST attack. How should C forge RST packets?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.本片以现代文化为背景，以中国成语故事为主要题材，以动画为表现形式，由不同的成语故事所组成。片中角色的表演和情节设定均围绕成语本身寓意展开，并大量融入诙谐轻松的表演，让原本含义深刻的成语变得更有新意、更有趣味性。主角“倒霉先生”在这些成语故事中扮演着形形色色的身份，体验不同经历，上演了一幕幕轻松幽默又寓意深刻的故事。孩子们在精彩的故事中体会成语所包含的深刻内涵，了解中华文化的源远流长与博大精深，达到寓教于乐的目的。该剧讲述在机场附近开民宿的夫妻（成东镒、陈熙琼饰演）和在航空公司上班的各种职位的人们一起生活，组成奇特的家族的故事。徐芝释饰演飞行员，李本饰演暗恋徐芝释的乘务长。一组年轻人重回到工作过的夏令营营地，意图掩盖五年前的一场意外。随着他们的到来，营地每天都有人意外死亡，究竟五年前发生了什么，谁又是凶手。为什么？刀客看向远方，眼中慢慢变成一片冰冷，声音里带着一抹决然。