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If the message has been matched by the previous rule, iptables performs the corresponding action on the message, Even the latter rules match the current message, It is very likely that there will be no chance to perform corresponding actions on the message again. Take the above figure as an example, the message is first matched by the first rule, so the current message is "released", because the message has already been released, so even if the second rule in the above figure can match the message just "released", there is no chance to discard the message just now. This is how iptables works.The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.三位年轻的足球运动员在一家虚构的英超俱乐部的不幸遭遇。LasEncinas是西班牙最优秀、门槛最高的学校，也是精英阶层子女就读的去处。在地震震毁一所平民学校后，地方议会决定将学生们分至本地各校中，三个工薪家庭的孩子因此来到这所贵族学校。一无所有的穷孩子遇上应有尽有的富二代，激烈的冲突爆发，最终竟酿成谋杀。那么，罪魁祸首到底是谁呢？by:meijubar.netLooking at the INPUT chain in the filter table again, we find that the rule has been added. In iptables, the action is called "target", so the action corresponding to the taget field in the above figure is DROP.