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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.新的城镇，新的学校生活，以及新遇到的朋友。魔女学校中的扫帚飞行课程以及充满魔法气息的不可思议的授课等等，在这些只有魔女学校中才有的课程当中，阿科与萝特、苏西等人引发了大骚动！Logic entry of program module: main page (Fragment containerActivity), WebView page, sweep page, e-commerce: shopping interface, order confirmation interface, payment interfaceThe Ministry of Labor and Social Security may propose amendments to the plan. If no amendments are proposed within 14 days after the plan is received, it shall be deemed as approval.本剧讲诉了杉并中央署集合了几个专门处理麻烦的「万能咨询室」的成员的故事一个偏远贫穷的小山村里，活泼善良的女娃小花，在爹娘和奶奶的呵护下，过着虽不富裕但却快乐的生活。小花娘就快生了，她爹为了多挣些钱去了黑煤窑打工。一个大雨滂沱的日子，小花爹被埋在了坍塌的煤窑里，小花娘也因为急火攻心加上淋雨引起大出血失去了生命。从此小花和瞎眼多病的奶奶过着相依为命的生活，懂事的小花用自己瘦小的身躯支撑着濒临解体的家，小花的眼泪和万般努力，最终没能留住唯一的亲人奶奶，小花从此成了孤儿。