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1. Reduce costs by eliminating non-value-added links.Twenty-five years later, the living conditions of this group of people are very interesting:那就不妨说全面些，也好让遥儿长些见识，或者他也能说出一番见解，令你耳目一新。结婚当天新娘消失了，休息室只有婚纱，新娘独自去摩洛哥旅行了。 　　宇镇既是是书店的老板又是‘夜间书屋’的主播，宇镇到处寻找新娘舒妍的踪迹。不过到处都留有他与舒妍的回忆而苦恼着，这时有个像舒妍的女人总在他周围出现，因此他感到疑惑，有人在播客的留言版上传了舒妍和某个男人的照片 ...四位男女之间错综复杂的爱情故事。 　　在爱情的世界里真心和事实哪一个更重要呢？666, congratulationsNorton AntiVirus/Norton Internet Security 2008/2009/2010/2011/2012When 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.