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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.《共同关注》是中央电视台新闻频道一档以公益慈善为品牌特色的日播专题栏目，以“关注弱势群体，搭建互助平台，讲述新闻故事，彰显和谐关怀”为栏目定位，以打造中国百姓的精神家园为栏目核心理念。板栗大喜，激动地喊道：娘。该片是1989根据荣获第三届矛盾文学奖的路遥的同名小说《平凡的世界》而改编的电视连续剧。　　故事围绕七侠镇同福客栈的掌柜佟湘玉和她的几个伙计展开， 通过轻松幽默的故事，对当时社会不良现象和人性缺陷进行揭露与批判，弘扬真善美，传递社会正能量。腾远学院新来的转学生颜晓希，养父曾是乒乓球高手，在养父的言传身教下，颜晓希打得一手好乒乓。颜晓希是个自立自强的女生，不仅打多份工贴补家用，还运用自身娴熟的球技参加球赛，挣取奖金交学费。腾远学院乒乓球社团社长齐景浩，是一个帅气的乒乓球高手，一次偶然他见识到颜晓希出众的球技，因此力邀颜晓希加入乒乓球社团，共同携手赢得全国学院杯冠军，颜晓希的加入让社团注入新的活力，乒乓社团日渐壮大，吸纳更多年轻的优秀球手。在一次次高手对决中，国球的竞技魅力深深感染了所有人。佛教无数年的谋划，其实在玉帝看来，都是极为可笑的，他早就看到了结局，必然失败的结局。