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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.可是，王大人的威严却仿佛失效了。咚咚。相信天启。乔家老头子乔守诚去世前悄悄立下一份遗嘱，将所有房产都留给了独子乔曙光，没有几个女儿的份儿。老伴郭宝银无奈之下只能顺从，但为了维护家庭和睦、为了几个非亲女儿着想，她一直没让这份遗嘱公开。随着老宅即将拆迁的喜讯传来，几个子女各有打算，都想通过房子来解决各家的燃眉之急。郭宝银本想公平合理的分配，却为那一纸未公开的遗嘱犯难。久未谋面的老叔乔守信突然出现并用计想骗取房产，一家人齐心合力揭穿了老叔的骗局，但面对老叔的举动曙光不得不提前将遗嘱公布。一时间姐姐、姐夫们即震惊又气愤，郭宝银也被推到了风口浪尖。在郭宝银的劝说下，曙光想放弃遗嘱但却遭到儿媳尤小惠的强烈反对，甚至以离婚相要挟，同时乔家的第三代人也卷入到矛盾当中。但郭宝银始终不肯放弃，最终所有的矛盾和危机都被亲情一一化解。老太太十分挂念，叨咕道：听说考场里面啥也没有，苦的很。