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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.In centos6, you can save the rules by using the "service iptables save" command. The rules are saved in the/etc/sysconfig/iptables file by default. If you have just installed centos6 and started using iptables, you will find some default rules in the filter table. These default provided rules are actually saved in/etc/sysconfig/iptables. Examples of saving rules are as follows.成为幽灵青野龙平和女友刈谷优里绝对无法接触的高中生情侣通过鲜明的恐怖描绘不可能实现且不被原谅的恋爱、连死都分不清的终极恋爱。? ? If they remarry, their marriage relationship should be restored. If the former spouse is married to another person, the latter marriage is protected. If the children of the person declared dead are adopted by others according to law, whether the adoption relationship can be dissolved can be settled through negotiation.莲弟，你带谁一起来了？屋内传来一道娇媚的声音。故事讲述十年前的一场残酷的细菌侵袭灭绝了斯堪的纳维亚的绝大多数人口，一对年轻兄妹开始了一段寻觅安全处所的旅途。兄妹二人唯一的向导是父亲的日记本，里面记录了细菌与新世界的危险。他们加入其他年轻幸存者的行列，开始了险象环生的跨境之行。面对致命灾难，这帮人必须迅速意识到，最大的危险并非来自外界，而是来自内部。