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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.If you want to buy a one-day ticket, click on the red box in the lower left corner and choose the ticket you want.Fan Bingbing Spokesman: 2.5 Million RMB Every Two Years Liu Yifei Spokesman: 3 Million RMB Every Two Years该剧是一部浪漫奇幻悬疑剧，讲述金瑞镇因为年幼的女儿被绑架而备受打击，以及生活在一个月前的过去的女人为了拯救她爱的人而孤军奋斗的故事。生活在现在和过去的两人邂逅后，为了挽回已经发生的悲剧，每次都经历新的真相和事件。由《不是机器人啊》《春天来了，春天》朴胜宇导演执导，李秀贤编剧执笔。　　许浚森（陈展鹏饰）是O记精英干探，勇武能干，深受上司器重及战友欣赏，但他最终梦想却是加入飞虎队。另一名O记精英干探沈韦力（黄智贤饰），有着精明头脑及丰富经验。二人处事方式虽截然不同，但惺惺相惜，彼此互补不足。After the installation is complete, execute the service docker? Status can view the status of the docker: