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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.[Arrow Factory Video] Says to It/She (1): Exploring Adult Silicone Doll Factory年前的科学家塞斯刚刚发明一台能传送物体的“电动传送机”，这台机器能将物体分解，传送完成后再自动合成还原。兴奋不已的塞斯决定亲自体验一下电动传送，于是，他进入了传送仓。不幸的是，一只苍蝇这时也飞进了传送仓，于是，在机器将分解后的塞斯的分子再合成时，将苍蝇的分子也合成到了塞斯的体内。塞斯成了拥有一半苍蝇基因的蝇人......********我娘来了。　　晓红昏了，她发现自己对马勇仍有感觉，但张琪不问回报只求付出的劲儿，却又打动了她.迷失间，她答应了张琪的求婚！并选择最了解她的马勇筹办婚礼！马勇骑虎难下… 为晓红制造完美婚礼过程中，决心抢回晓红和张琪一决高下。就在行礼一刻，马勇不顾一切向晓红表白，张琪当然也表现的毫不示弱！Suppose we get the inventory of all colors of mobile phones from the background in advance.