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.
小提琴的流浪从未间断，从盗墓者，到吉普赛人，到为之自杀的作曲家波普，再到文革期间上海的一位音乐老师。这期间，无论拥有者是否明白小提琴真正价值，都逃不出它的魔力。终于，有鉴别专家知道了小提琴的秘密——它的外壳染着三个世纪前一位大师的血和泪。
Ace Training Program//150
Uncle Ou said it twice. The first time was when talking to Green Valley before the sports festival, and reminded him not to forget his mood when he was in the seaside park. The conversation between Uncle Ou and Green Valley seems to cross the episode. Don't forget to look at it. The second time was the episode of "Riding a Horse to Declare the Victory and Lost". When Ka was facing the object, Uncle Ou said to Ka in his heart.
Fire time, fire location, fire cause, alarm mode (referring to automatic, manual, etc.), fire extinguishing mode (referring to gas, water spray, water spray, foam, dry powder fire extinguishing system, fire extinguisher, fire brigade, etc.)
——两人的距离，还没有名字。
郑氏一愣。
女主人公顺英是一位6年来费尽心神寻找儿子的泼辣女子，虽然聪明却纯真得有一点傻气；男主人公启弼则是一位与孩子没什么两样的吊儿郎当的财阀之子，有爱心却很笨。
Note: When conducting iptables experiments with reference to this article, please be sure to do it on your personal tester.
浙江卫视推出的大型原创室内竞技真人秀节目，每期围绕一个主题，邀请两支王牌团队，由两队固定队长各带领多名热门IP嘉宾进行PK对战，通过才艺比拼、游戏竞技，决出王牌中的王牌。
1943年秋，常德保卫战爆发前夕，城内动荡不安。小警察何平安平静地生活了九年，作为一名红军老战士、地下党员，他照顾烈士遗孀和幼子，在常德隐姓埋名。在一次执行公务的时候，何平安与大小姐沈湘菱不打不相识。日本人投放细菌弹造成常德城伤亡惨重。为了常德的百姓安危，何平安与潜伏的日本奸细展开了连番的斗智斗勇，但身份被迫暴露。沈湘菱惊诧之余对他倾心。日军冲破外围防线，对常德步步紧逼。沈湘菱与何平安并肩作战。在常德苦战16天，弹尽粮绝常德城沦陷。何平安在巷战中壮烈牺牲，沈湘菱带着烈士遗孤等到了常德城光复。
The second season of "Charming China City" has been upgraded completely, "Charming China City? The establishment of the" City Alliance "and the official launch of the" Charming Card "program mean that there is a broad prospect for the deep integration of culture and tourism, and the sustainable development of the city will also usher in a new breakthrough. CCTV's combination of boxing to help the poor through tourism shows the sense of responsibility and mission of the national big station.
Kick tank
政宇看到在意大利的任务搭档是惠仁后大吃一惊。在豪华的宅邸举行的派对上，身穿华丽礼服的惠仁走进宅邸。政宇轻松打倒在屋顶上监视的警卫人员，成功在派对现场和惠仁会合。惠仁慢慢接近目标，正当作战计划即将成功时，被对方警卫员察觉，对方开始追击惠仁和政宇。
至于那位堵截的人显然不是赵高手下，那会是谁呢？萧公角很是疑惑，项羽则是完全不放在欣赏。
怪咖们联手策划校园音乐剧，准备度过疯狂的一学年，但严厉的新校长却禁止音乐剧的上演，现在得靠朱莉娅流转局面
是坦诚无畏，是温柔如歌！是风华正茂，是未来可期！是初生牛犊不怕虎，是明知南墙也要撞！湖南卫视中国新一代青少年健康成长心理释放表述节目《少年说》第五季再次集结！少年们，勇敢说吧！
(2) Three spheres perpendicular to each other.
