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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.至于丞相萧何和城内的将士，只怕是难以幸免了……不过到了这个时候，已经没有多少人在乎和挂念他们，他们在乎的是汉国的将来，汉国的生死存亡。The MDT should have a policy that regulates:本剧是刻画结婚前的主人公被在工地偶然遇到的穿着尼卡波卡的男性所吸引而开始纠结的恋爱剧。杨寿全早已坐在桌前，只挥手到：别理她，过来吃饭。喏，就是这黑黑的，跟酱一样的东西，都拌开了……话未说完，汉子们都用手捂着嘴，连滚带爬地扑向洞外。彭15是中学，因为它确实发生在2000年。安娜·康克尔和玛雅·厄斯金扮演的是13岁的被遗弃者，周围都是真实的13岁的年轻人。