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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.Wobany introduces several classic methods here to detect the advantages and disadvantages of network cables.青山医学院虽然名义上是私有的，却是皇叔秦枫掌管，几乎就是靖国官方的医学院，还不用朝廷拨款。Netflix及法国台Canal+同时预订8集惊栗剧《安全 Safe》，该剧由Harlan Coben负责﹑Danny Brocklehurst执笔，现定于美国时间5月10日上线。《双面法医 Dexter》主演Michael C. Hall在剧中饰演主角Tom，身为英国小儿外科医生的他，在妻子去世后独自抚养两个年轻女儿Jenny及Carrie；然而当某次Jenny偷跑去派对，派对却发生了谋杀案，而且Jenny还失踪了，这将大大的改变了主角的生活，而且更把秘密暴露于表面。Amanda Abbington亦加盟了本剧。四名聪明的学生成立自己的侦探所，把冒险发布到播客上，成为彼此的可靠好友。在民国初年，在偏僻落后的村落 — 平安谷内，男尊女卑的封建思想下，女人一直被男人欺压。一对受了西方思想薰陶的夫妻，返回平安谷，想改变、建设家乡，可惜遇到新旧思想的冲击，困难重重，还被卷入神秘的幽灵新娘杀人事件、绑架及凶杀案中，原来背后有一班被男权压迫、欺凌的女子，她们暗中结盟，进行复仇行动。例如，上次封神之战，阐教是赢家，阐教仙人一个个可以继续逍遥自在。