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In fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are2095年10月31日。1948年9月，我中国人民解放军攻打济南城，华东野战军某纵队团长毛宝在战斗中和多年前失散的好友陆胜文再次相遇，此时陆胜文已是国民党军的副旅长。王司令员爱惜毛宝的打仗才能，让他将功补过，组建“老虎队”。淮海战役打响，老虎队作为先锋部队，先后攻克了新安镇、碾庄圩，击毙了黄百韬。解放军在民兵队的物资支援下，所向披靡，一路打到了徐州，包围了杜聿明集团。老虎队攻打徐州城，毛宝和陆胜文再次相遇，双方决一死战，国民党军节节败退，毛宝深入虎穴劝说陆胜文起义，陆胜文弃暗投明，兄弟再次联手，消灭了杜聿明的部队，我军赢得了淮海战役的胜利，老虎队的战士们在战斗中一个个牺牲，成为了建国史上的英雄。尹旭算是彻底狠下心来，必须重重的教训他们一顿，否则他们还真不知道这越国的天是谁的？再者，要是传扬出去，徐家已经这么冒犯他越王的权威，若是处罚过轻的话，以后可能还会别当成是软柿子，所以这一遭必须强硬。This kind of attack was discovered as early as 1996, but it still shows great vitality. Many operating systems, even firewalls and routers, cannot effectively defend against this kind of attack, and it is very difficult to trace it because it can easily forge the source address. Its packet characteristics are usually that the source sends a large number of SYN packets and lacks the last handshake ACK reply of the three handshakes.