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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.　　此时，阿伦的好友画家周以乐（释小龙 饰）将这三角关系全看在眼里。对于雨婕，他有着一份特殊情感，原来四年前的那个大雨磅礡的午后，是他救起了发生车祸的雨婕……上水村村主任钱大宝在为女儿办毕业宴会的时候，发生了食物中毒，全村几十人一下住进来了医院，而引起食物中毒的罪魁祸首是用污染的水浇灌出来的青菜。人命关天，但钱大宝却不相信这个事实，虽然上水村只有他弟弟钱二宝开的一个工厂，但他相信他弟弟的话，这个工厂有排污设备。而承包水库养鱼的满一花却一直盯着钱二宝的工厂不放，因为污染在水库里表现得最为明显，她养的鱼在市场中卖不上价最后竟然无人要了。The people's governments at or above the county level should strengthen the construction of the supervision capacity of medical security funds and encourage and support all sectors of society to participate in the supervision of medical security funds.Http://baike.baidu.com/view/1306799.htm定陶城外的道路上，一辆马车正在飞奔，车厢里燕女看着满身是血的范阳啼哭不止。When a child has no experience and related concepts of things, there is no way to classify them effectively. The same is true of adults. Therefore, classification ability involves experience and knowledge, and involves conceptual ability.