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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 rest of Song Guochun (in the sea, close to each other) kept pleading, but Liu Guiduo did not speak and we did not dare to save him. Liu Guiduo said, 'Take it up'. Huang Jinbo and I pulled him up. I saw his head bleeding and found a paper towel to wipe him.Resource consumption class is a typical DDoS attack, the most representative include: Syn Flood, Ack Flood, UDP Flood. The target of this kind of attack is very simple, that is, to consume normal bandwidth and the ability of protocol stack to process resources through a large number of requests, thus achieving the purpose that the server cannot work normally.九一八事变爆发，戍边家族顾家抵抗日军，惨遭灭门。顾家养女顾雪萤幸免于难，前往齐齐哈尔寻找未婚夫顾照龙。顾照龙卧底成为伪满军官，顾雪萤以为他已经叛国，为维护家规，决心杀死顾照龙。顾雪萤前往千山投奔抗日义勇军，并参加义勇军三打哈尔滨之役。后义勇军在共产党领导下改组为东北抗联 ，真正发挥出了战斗力。顾雪萤发现顾家的忠义信条，与共产党的纪律不谋而合。她在战场上数度与顾照龙相遇，却始终没能手刃对方。在一次次战斗中，顾雪萤与参谋沈雷志渐渐相爱。沈雷志被逮捕到新京，顾雪萤潜入营救，发现对手又是顾照龙。抗日战争接近尾声，已经得知真相的顾正雪被编入教导旅，与顾照龙一起打下了东宁要塞，顾照龙却……中国的抗日战争进入到最艰苦的阶段,缅甸沦陷,日军侵犯云南的畹町,龙陵,腾冲,滇缅公路被迫中断,由此,最后一条通往中国战区的通道也被切断,使外国援华的物资无法从缅甸运入中国……