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几个姐妹正在小屋内享受假期时却遭到了几个戴着面具的闯入者的袭击，她们必须奋力一战才能活过这一夜。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.杨长贵摇头笑道，天下人都信状元铃，我也不信。由此可以看出，此人根本没有将徐家放在眼里，似乎还有着相当大的敌意。林聪摇头道：不行。美籍华人商业钜子傅先松携孙女为躲避黑社会组织的追踪,辗转到达中国,但刚到中国就被策划了五年的台湾"飞龙帮"两名黑社会成员绑架，勒索5000万美元，武警、公安迅速展开行动，进行围堵，剧情由此展开…………名誉债名誉债名誉债名誉债