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DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.However, in the world of iptables, The most commonly used matching condition is not "dignified", But the "source address", "destination address", "source port", "destination port" and so on of the message, In the world of iptables, The most commonly used actions are ACCEPT (Accept), DROP (Discard) and REJECT (Reject), of which ACCEPT is similar to the "Release" in our example. However, the matching conditions and actions we mentioned just now are not all, but the most commonly used ones. The specific matching conditions and actions are not the focus of our discussion today, and we will make a summary in future articles.　故事讲述《摄影机不要停》拍完后半年，剧组准备了新桥段拍摄，30秒预告片及海报今日曝光，网剧继续运用一镜到底拍摄，还有恶梦又再重现，女主角秋山柚稀戴假发扮金发美女，饰演导演的滨津隆之在海报中睡棺材护国良将许精忠之子许三元，仁厚重诺，轻功了得，公主对他暗许芳心，但骨子里充满侠义之道的他看破了官场黑暗，离京出走，半路上却与聪明顽皮杀富济贫的江湖魔女童芊结下了不解之缘…… 许三元幸被凌云洞一老道救起，得知身世后深感同情，在洞内教他苦心修炼，并授予绝世好剑，他决定出洞下山寻找挚爱，激情能否重燃？他决心再出江湖，看四海之内谁与争锋……远端，又有一艘海马船跟着求救，周围四艘舰同样自觉靠拢。Episode 6