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《国防科工》栏目是CCTV-7国防军事频道推出的一档电视杂志类专题节目。节目将展示我国国防科工领域取得的重大成果，科工人以身许国的家国情怀以及全球国防科工领域最新成果和动态。《声恋时代》讲述的是一位女孩何朝朝因一场车祸改变了命运，在危难时她听到一个非常好听的声音鼓励自己支撑下去。为了寻找这个声音，何朝朝找寻了互联网上各个声音频道，并因缘际会进入了配音社团“声恋工作室”，认识了两位大神级人物欣辰与苏默生。在更新换代的配音行业发展下，何朝朝的梦想也与工作室的众人紧紧联系在了一起。There are many kinds of injuries in WOW, such as ice, fire, shadow and nature. . . Among them, the natural damage small D and SM have, small D's anger. Lightning of SM. .怎么可能在这个时候对楚军发起夜袭呢？最初的时候，他还以为是彭越的军队，先发制人。When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.