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The command in the above figure does not use the-t option to specify the filter table. We have been saying that when the-t option is not used to specify the table, it means the default operation filter table.小灰就趁机把那四个肉包子叼进了床底下。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.女影星安虹为了筹拍她的自传体电影《回忆》，在全国范围登出招聘启示寻找一个二十出头的女孩子来演她的青年时代。山东女孩夏婴子从报上看到了这则招聘消息后兴奋不已，她瞒着妈妈偷偷地从山东跑到上海来应聘……1978年，朋克、迪斯科和涩情片，这座城市永不眠。对于全心全意等待圣诞老人来临的北北来说，圣诞前夜的降临是一件很幸福的事情，因为圣诞老人会给他带来礼物，而他的愿望就是拥有一张魔术毯子！！礼物送来了，北北小心翼翼的打开了它……出现在他眼前的竟然是一个巨大的杯子。具有魔力的杯子带着北北来到了他做梦也想不到的地方----北极！在北极遇见的第一个“人”居然是一只正在钓鱼的熊，更令北北吃惊的是这里还不只白熊一个...