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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.一九三七年八月三十一日淞沪会战中，姚子青奉命率部五百余人守卫宝山县城。日军为扩大登陆地域，对宝山进行了海陆空协同的疯狂攻击。在装备落后，地势不利，没有援军的情况下，智勇双全的姚子青带领全营以寡敌众坚守孤城，灵活运用战术战略，从主动出击攻袭敌军到固守阵地顽强抵御，七日内击退了日军一次又一次的进攻，全营五百余人先后战死沙场。九月七日日军破城，姚子青率残部二十余人在城内展开激烈巷战，最终壮烈殉国。接着就是分发奖赏，其喧嚣热闹也无需一一细述。故事发生在风景如画的苏州河畔，修车匠高志华可怜小裁缝秦楠无处安身，遂让她把摊子摆在自己的摊子旁边，一来二去之间，两人的关系逐渐亲密起来。高志华的母亲对温柔贤惠的秦楠十分满意，着急儿子终身大事的她对高志华和秦楠之间的感情十分支持。Receiver receiver = new Receiver ();见妻女安然无恙，吴芮终于放下心来，微笑着向一旁的尹旭点头示意，表示感谢。2. Sensitivity