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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.步入中年，卓也（中山俊介饰）对家里的黄脸婆妻子不可自抑地产生了厌倦感，有一天，他在药店里发现了“倦怠期特效药”，妻子服食后，居然变成了大美人（井上和香饰）！胡宗宪独坐帐中，微微叹息。林佳乐、林佳琪、王志伟和江乘风，四名在不同领域的工程师，抱着同样为人类未来造福的梦想的同时，也寻寻觅觅地在这世界上找着自己梦想中的另一半，四人到底最终是否能梦想成真呢？梦想开始：佳乐渴望爱情，又害怕爱情，全因心中的“魔咒”作祟，担心一旦对身边男子有好感，对方便会遭到不幸，因此对男人，佳乐是望而却步，深怕自己会情不自禁喜欢上对方。佳乐第一次碰到志伟，对志伟却是厌恶到极点，误会志伟抢劫了了父亲王强。佳乐为了惩罚志伟，把志伟抢劫父亲的片段上载到网路，让志伟顿成了过街老鼠，人人喊打。没想到冤家路窄的两人，偏偏原来是同事。志伟不但是佳乐的新上司，佳乐还无意中救过志伟，可是佳乐从来没有告诉志伟真相，志伟也一直以为救他的是司徒艳。和佳乐不同，佳琪对爱情是充满理想的，可是期待的真命天子却迟迟未出现，直到那一天佳琪遇到了乘风。乘风到佳琪的公司维修机器，意外害得佳琪扭伤脚。乘风见佳琪受伤，好心送她到画室上课，不巧写生的模特儿没到，佳琪于是乘机报复，推乘风上阵。乘风受不了激将法，冲动答应，却没想到原来是充当人Method 2: Delete rules according to specific matching conditions and actions等到秦国覆没，项羽回师彭城，齐国的噩梦也就开始的。啊？杨舟张大嘴巴，然后揉揉眼睛，发觉自己并没有看错。