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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.2. # # # # # # # Slave Config (redis.conf)ABC宣布续订新剧《#终生# For Life》第二季。Common goal: Through the layer-by-layer decomposition of strategic objectives and key tasks, performance management is used as a means to ensure that the company has the same desire from top to bottom.The person responsible for communicating MDT recommendations to patients and their medical teams should be clearly identified, and the way and time of communication should be recorded.美丽坚强的陆依萍与母亲相依为命，为了生活，她不上了歌舞厅的歌女。为了报复父亲与后母对她们所做的种种，依萍抢走了后母给妹妹如萍的男朋友何书桓。在交往中，依萍被书桓的深情所感动，双双坠入情网。天意弄人，在偶然的机会中书桓知道了依萍的报复心理，两人产生了误会。为了报复依萍，书桓与如萍订婚。经过家庭的巨变，依萍与书桓冰释前嫌。然而如萍经受不了打击自杀身亡，书恒与依萍为此也面临分手的考验。经过陆父的开导，依萍与书桓终于打开心结，重结良缘。