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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.他能回来，说明他的心在汉国，他将效忠于汉王您。讲述了龙眼寺一对奇葩蜜探的乌龙探案之旅，最终查明真相，守护神都安宁的奇幻故事。On December 20, 2016, I entered the first horse. That time, the founder of the club, Teacher Zhao, shared the "Investment Opportunities I Missed in 2016" and felt the enthusiasm and enthusiasm of the horse owners. Everyone was very comfortable on the stage and had a high level of speech, so he said on the spot that he would join the horse.此时听到萧何这样说，韩信有如何会不动心呢？心中难免会有这样那样一些想法。Modify the onInterceptTouchEvent () code for ViewGroup2 as follows:　　伍兵为了案情与贺雪薇一起去找晓琳晓琳因为抗拒父亲强暴失手杀了而逃到湛海市并贩毒头目司徒杰手下做过事所以决定远离湛海萧文却误认为伍兵和贺雪薇太残酷无情把晓琳赶走