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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.Data show that there were more than 6,000 companies engaged in private lending intermediary business when P2P platforms were in hot demand in China. After three years of survival of the fittest, according to incomplete statistics, there are only 1,958 platforms left. It can be predicted that the number of P2P platforms will continue to decrease. At present, some financial intermediary companies in Yixin, Auction, Qifang and Qingdao are relatively recognized. The following is a typical analysis of these P2P enterprises. Auction and loan: unsecured and unsecured mode. Auction and loan was established in Shanghai in 2007. It is a typical P2P online credit platform in China and can be used as a typical sample of P2P websites in China. Auction and loan use competitive bidding to realize the online lending process. The loan interest rate is determined by the supply and demand market of the borrower and the bidder. The enterprise does not charge other fees, and the main profit comes from service fees. The main process is as follows: the borrower releases the loan information, lists the relevant information such as the reason and amount of the loan, and gives the highest interest rate. Investors participate in the bidding, and the person with the lower interest rate wins the bid. The web page will show the borrower's loan progress and the number of bids completed. If the total amount of bid funds meets the needs of the borrower during the fund raising period, his loan will be declared successful. If the required funds cannot be raised within the prescribed time limit, the loan plan will be suspended. This mode of risk control has two characteristics:扣人心弦的《血色星期二》第二部再次席卷而来。天才黑客高木藤丸（三浦春马 饰）这次又会遇到什么棘手的问题呢？《同居损友》是一部都市青春题材的情景喜剧，由爱奇艺独家出品，著名网络作家有时右逝编剧，新锐网络剧导演徐雷执导。讲述的是三男两女，五个身份背景、人物性格各不相同的年轻人，在大学毕业后两年左右共同留在北京，人生事业爱情刚刚起步阶段的故事。《格林》是由美国NBC电视网定制，Jim Kouf、David Greenwalt打造，大卫·君图力、塞拉斯·威尔·米切尔、比茜·图诺克等主演的系列魔幻类电视[1] 。故事和角色多改编自《格林童话》，是一部讲述格林后人尼克· 布克哈特（Nick）与世间魔鬼斗争的童话罪案剧，在此过程中他与自己结识的同伴经历磨难，并且一边学习古老的知识和技能，一边经历着成长和未知世界的探索[2] 。Synchronous EventDemultiplexer----Selector郑氏听着外面乱糟糟的声音，对靠在车壁上养神的张槐笑道：刚出来，跟放飞的鸟儿似的，肯定要新鲜一阵子。