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Figure 13 Number of Foreign Reflection Servers Used to Launch SSDP Reflection Attacks This Month by Country or Region or RegionThere are two waysNBC宣布一口气续订《#芝加哥警署#ChicagoP.D.》三季。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.切莫说鱼跟兔子比不上人，岂知在它们眼中，人不是最可恶的？我们逮鱼，上天不会觉得我们可恶。如果您喜欢这部作品，欢迎您来（.）投推荐票、月票，您的支持，就是我最大的动力。澳大利亚一对年轻夫妇因为孩子的失踪陷入了无法想象的悲剧中