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A DDoS attack is an attempt by an attacker to deplete resources available to a network, application, or service so that real users cannot access these resources. It is an attack by a group of malware infected computers or voluntary client computers that attempt to deplete the resources of a specific network, website or service. However, not all DDoS attacks operate in the same way.So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.不，我不能回去。二十年前，净天派因受到邪派卢戎部落长老的挑拨，与武林为敌，受到武林四大家族和蜀山围攻，掌门江傲天送走已怀身孕的妻子欧阳倩，自己被蜀山镇压在禁洞中。二十年后，傲天之子江一凡偶遇身患怪病的唐若云、蜀山弟子小蛮及龙羽后，他是净天派首领江傲天的儿子的消息不胫而走，被视为江傲天孽子的他，成为各家追杀的对象。一凡胸怀赤子之心，坚守正道，忍受着世人异样的目光，通过重重考验拜入蜀山门下，发奋练习，进步神速。但他却因自己的身世不敢面对与唐若云的感情，烦恼之时发现若云竟身患绝症，生命危在旦夕。一凡历经千辛万苦，虽救出生父江傲天，但无力挽救若云。伤心之余他依然坚持心中正义，不受奸人挑拨，以高超的武功和强大的人格魅力赢得了武林各派的信任。最后父子联手，打败邪派长老，拆穿了他妄图颠覆武林的阴谋，维护了江湖的和平。随后不久，大刀王五被奸人所害身首异处。霍元甲得知消息连夜去为义兄收尸，虽然让王五留存全尸，却给霍家引来大祸，致使霍氏男丁尽死。一年后，隐居沧州的霍元甲出山走镖，却不想又陷入仇家圈套之中，费尽千辛万苦，虽然洗脱干系，却让他心灰意冷，他由此决定南下上海。霍元甲的精武门很快就在上海立住了脚跟，霍元甲的名气也越来越大。这让已经将侵华列为国策的日本人十分不满，面对日本人的挑衅，霍元甲带病上阵，在与日本人的最后较量中斗智斗勇，最终凭借过人的胆识挫败了日本人的阴谋。