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秦淼诧异地问：你从哪摘的？板栗笑道：昨天看见了，我就摘了不少，洗干净了收着给你用。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.Qingcheng Excalibur Order: When equipped with Excalibur Order, total damage * (1 +0.3).板栗便将午间他们出去后，雅间内发生的事说了一遍。陈平回答道：范阳蒯彻。尉缭点头道：飞影从彭城那边传来消息，楚国已经在集结军队，龙且已经从齐国赶回彭城了。Here we seem to simulate the process of a collection class, does it feel great? In fact, each class in JDK is also these basic things, plus some design patterns and some optimization. As long as we learn and master these things, we can also write our own collection classes and even frameworks!