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A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.On ntp servers, a series of mode7 debugging interfaces are usually implemented, and the monlist request in the interface can obtain the ip address and other information of the last 600 clients synchronized with the target ntp server, and only needs to send a small packet to start a large number of continuous udp corresponding data packets containing ip address information and other data.        1985年，那时正是美苏两极争霸越演越烈的年代，史泰龙自导自演的洛基系列也出到了第四集，这一系列影片旨在振奋人心、宣扬美国精神。这一集讲述的是洛基（西尔维斯特•史泰龙 Sylvester Stallone 饰）的好友前美国拳王到苏联出战他们研制的拳击机械人，不敌对手最终身遭不测。为了帮好友复仇和维护国家荣誉，洛基决定再次出马。  出战前，洛基进行了一系列精心的准备工作，他深入到大自然，利用自然的艰苦条件刻苦训练。当一切准备妥当，洛基和苏联拳王――拳击机械人的决斗展开了！　　舅舅知道此事后并带梅子来到武工队认人。上级派来的地委书记甄一然来报道的路上受到日军的阻挠，孟司令率部队及时赶来才是甄书记一行安全到达。孟司令首先是夸赞常发的英雄事迹，谈话中甄书记听的出孟司令对常发不是一般的爱戴和欣赏。Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.If you want to play NeoGeo system games, you need a NeoGeo.zip file in addition to the game ROM.