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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.风景秀丽的海滨小镇汉普顿，是一个为蔚蓝大海所包围的权贵聚集区。觥筹交错，纸醉金迷，莺歌燕语，上流社会的人们沉湎在看似永无止境的富足快乐氛围中，殊不知危险将近。美丽女孩艾米丽·索恩（艾米丽·范坎普 Emily Van Camp 饰）租下一幢靠海的房子，这里似乎充满了其儿时的记忆，只是记忆中多了几分伤感与痛苦。不久，艾米丽结识了帅气的丹尼尔（乔舒华·鲍曼 Joshua Bowman 饰），格雷森家族的公子，其母亲维多利亚（玛德琳·斯托 Madeleine Stowe 饰）即是家族内当之无愧的领导者，也是汉普顿众所瞩目的风云人物。艾米丽有条不紊地融入格雷森家族，展开了一段绵亘十七年之久的血腥复仇……Netfilter is a packet processing module inside the core layer of Linux operating system, which has the following functions:TVB台庆剧由王浩信、唐诗咏、张曦雯等主演《解决师》接捧《金宵大厦》播出，今年TVB的三部台庆剧之一。Review the correct practice method:Public class Storage {如今他回京城了，还怕找不着媳妇。