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I myself am an opponent of this view, "a latest study." What study is this? [Researcher] What kind of researcher is this? There are many things that are actually meditated by irresponsible people such as laymen or editors of health magazines, and even deliberately put forward some seemingly novel and constructive opinions. Are you a researcher who stays on the weightlifting team every day and follows the strength lifters to train and track the competition every day? Don't pick up the window sill and see the training of the professional team with two eyes, so you dare to extend these eyes to common training methods.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.曹氏也看着郑氏若有所思。若是当他坏人，早抓起来了。老林年逾四十还是个单亲爸爸，个中苦闷异于常人自然不言而喻。更特殊的是他的职业——人民警察。作为警察他自然是尽心竭力，心系人民，他的电话24小时不关机，而且几乎管片的居民都有他的号码，大事小情他都风雨无阻。老林和所长喻嘉是多年合作的好同事，要不是刘小小疯狂追求老林，两个人都不会意识到这么多年来两个人在工作以外也产生了男女之间的默契和情感，可即便意识到了，碍于面子和舆论，两个人都不愿先捅破这层窗户纸。就在焦灼之际，老林收到杀人犯寄过来的刀片和死老鼠，作为一个历经风雨的老警察，他不怕死，但很怕自己所爱的人们会受到连累。保护人民的同时也要保护自己的家人朋友。老林和派出所的同事共同面对来自罪犯的挑战。老将军将陪伴自己几十年的大刀传给他了，正教他刀法呢。第一和第二系列可通过流媒体平台Britbox North America观看。ITV工作室将在国际上发行该剧。