Fine wine
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.
嘻笑怒骂，妙济公上演逍遥逸事！智活佛笑道人间传奇，轻松逗趣!相传南宋绍兴元年，浙江台州府天台县李善人平生乐善好施，常常救济穷人。李善人老来得子取名修缘，这修缘像是与佛门结下了不解之缘，竟在自己成婚当天，不辞而别出家当了一个和尚，法号道忌。李善人夫妇心急如焚，从此卧床不起，遂派人寻找，等到道忌回到家中，李善人夫妇早已亡故，恶管家已霸占了李府家产，道忌经受不住这巨大的打击，从此疯癫不知去向。不知过了多少日多少月多少年，突然在街市中出现了一个疯疯癫癫的和尚，他惩恶扬善扶危济贫，有人叫他疯和尚，有人尊称他为济公。
听完后，永平帝和大臣们呆了一会，然后一致调转目光，看向板栗。
Reference
The above analysis shows that one of the first three situations will inevitably occur after intercepting down, so intercepting down is no longer considered here. Let's look at the difference between events after intercepting down.
除了杀了几个恶霸，不曾杀害一个好人，亦不曾有过**之事。
The picture shows Mr. Sun (first from the left) summarizing the contents of the symposium.
杨必归抓住了杨长帆的衣角，你总说，男子汉要多见世面，这样的世面，儿子想见见。
Laughing主动接
况且，臣还听说，皇上三年前曾下旨将秦枫之女赐婚与荣郡王之子——青龙将军洪霖，就更不能抗旨不遵了。
历史注定的事情，楚霸王焉会让人失望？话音尚未落地，扑哧一声，女子轻轻的娇笑声传来，项羽本就脸色发红，瞬间变得更尴尬了。
Download Address: https://www.oracle.com/technnetwork/java/javase/downloads/index-jsp-138363. Html
此番乃自投罗网，岂有‘招待之礼？话罢，他厉声一呵：拿下候审。
随猴将军走入花果山内，周青看到这里满山尽是桃树李树，奇异瓜果，粉花争艳，绿叶清脆，一条瀑布在万丈山峰之上悬挂下来，宛如水帘，无数白猿、金猿、大小老猴在山中嬉戏。
栏目通过版面以及动画片、动画电影和节目，丰富同学们和小朋友们的精神生活。
炼丹炉被踢翻之后，人间火烧八百里，原本单纯无知的红孩儿无意间成为受害者，不得不承受火焰灼烧之痛。其母为救他，带着他辗转各地，求医问药，红孩儿最终获得了三昧真火和焚天紫火的能力。在红孩儿得知自己遭受这一切痛苦的原因后，他决意报仇，与此同时，一场惊天的阴谋正在悄然策划，顽性不改的红孩儿站在了离魔道最近的地方……
歪在虎皮椅上的何老将军猛然挺身，眼中爆出异样神采，沉声道：说得好。
待他们远到不见踪影，杨长帆才下令返航。
