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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./applause (applause)不过，我还是耐心地看下去，也许里面的内容不错。　　金香起剧中饰演在刚开业3个月的“飞起来吧蝴蝶”理发店里实习的20代初半高兴一角。她是实习生中最年幼的人，早早地放弃学业，在美容业里努力打拼奋斗已有5年时间，虽然是个预备理发师但是不擅长社会生活，是个小心谨慎的人。乔氏集团在香港、台北、上海等地拥有巨大产业，富甲天下，势倾商野，堪称现代豪门。世纪之交，陈水扁上台，亚洲金融危机，9事件，世界形势风云突变，乔氏集团也隐患渐现，危机四伏……豪门之主乔正天风流倜傥，妻妾成群。其兄弟姐妹之间勾心斗角，尔虞我诈。曾选美一夜成名的港姐董楚楚缠上了乔家大公子乔夕，乔夕投资期货，血本无归，一个个巨大的阴谋在她俩的策划下渐渐浮出水面：连施美人计，迷倒老行长，诱逼大笔贷款；楚楚前男友身为警察却意外身亡，案件扑朔迷离；被张子强黑党“绑架”，借以敲诈父母巨额钱财……总裁助理汤俊生蛇蝎心肠，敏锐洞察形势之变，加紧阴谋抓权，浑身解数狂恋乔家长女乔枫，一番瞒天过海，偷梁换柱，一跃成为乔家大陆地区全权代理人，可祸福相依，好景不长：母亲跳楼自杀；夺产阴谋败露；与楚楚偷情，被死缠不放，竟丧心病狂地设计谋杀楚楚……小儿子乔晖与清纯靓丽、美貌如花的行长之女坠入爱河，谁知其父东窗事发，违规放贷被廉政公署立案侦察。乔家祸不单行，乔正天的父亲患上癌症，一直在美国与大陆失散的亲人齐聚豪门，岂料久别2. Testers侍女们急了，想上前拦阻又不敢。