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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.-Skills that can easily get feedback are suitable for self-study. For example, when programming and debugging run away, you will know what goes wrong. Continue to take English as an example. If you find some words and roots that you are not familiar with, add them to your favorites and repeat them when you are free. If you find that you cannot understand grammatical difficult prepositions, you need to read and learn about them. Feedback is very important, which determines whether learning is mechanical repetition or virtuous circle.Provide sufficient funds and resources to ensure sufficient personnel, time, equipment and facilities to facilitate the effective operation of MDT.严世藩的死，了结了一个时代，也终结了故人的冤屈。该剧改编自我国作家何署坤上世纪90年代创作的经典童话小说《蜜里逃生》，此书出版后被改编成话剧、音乐剧、电视剧等多种形式。迄今为止40集电视剧《蜜里逃生》已在包括中央电视台在内的全国所有地区的1000余家电视台播出。《蜜里逃生》在全国儿童剧创作上已经颇具影响，建立了比较稳定的观众群，并为进一步制作动画片和漫画产品打下了良好的基础。目前，三维动画《蜜里逃生》正在制作中。 　　五年级旦旦因语文期末考试差两分就100分而被爸爸妈妈取消了带他去旅游的承诺，孤独伤心的旦旦放走了被爸爸关在实验室的蓝眼睛蜜蜂，也无意中放走了爸爸试验培育的蜜蜂——WD蜂。 　　蓝眼睛（蓝蓝）回报旦旦吐了一口蜜让旦旦尝，旦旦终于如愿变成了一只自由飞翔的小蜜蜂，与蓝蓝飞上了晴空……张杨昂然道：自古就有嚼舌根的长舌妇，专会传播流言蜚语、惹是生非。