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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.Finally, I would like to mention three elements of SOC construction:《杰茜驾到 New Girl》主创Elizabeth Meriwether过去为FOX开发新单镜头喜剧《节上生枝 Bless This Mess》，不过在FOX把制片公司转卖给ABC的情况下，现变成由ABC直接以6集预订此剧，并确定在美国时间4月16日首播。该喜剧由E lizabeth Meriwether及Lake Bell执笔，讲述一对新婚夫妇（Lake Bell及Dax Shepard饰演）放弃了他们纽约市的生活，本着过简单生活的想法搬到内布拉斯加州，然而计划却没如他们想的顺利。其他演员包括Ed Begley Jr.﹑Pam Grier﹑JT Neal及Madison Curry。Political Conditions for Civil Aviation Pilots to Recruit;何况现在越军的兵力近乎两万，东瓯军怎么都翻不起浪花来。板栗笑道：柜子里被子多着呢，不差这一床。