论文部分内容阅读
一、引言 如果把Internet比喻成一个城市的街道网,IP地址就是各家各户的门牌号。门牌号不能和别人共用,没有门牌号,别人就不知道你住在哪里。IP地址对于连接Internet的计算机来说同样重要和不可缺少。如果某个居民小区的人口突然膨胀,新建了许多住宅,分配给他们什么样的门牌号呢?不能不着边际地乱起名,又要保持原来的序列,明明901、902楼已经有了,只好把旁边的新建居民楼起名为甲901楼、乙901楼等。同样,面临迅速膨胀的用户群,Internet在局部也会遇到IP地址不够用的问题。 我们发现,在城市居民区中有时会有几座楼被围墙围在一起,有一个公用的大门,写着某某单位大院。大院里的门牌号与居民区的其他人不同,可以自己定义。住户收到的信件先被邮递员送到传达室,再由看门人送到住户手里。那么在
I. Introduction If the Internet metaphor for a city street network, IP address is the number of each household door. House number can not be shared with others, there is no house number, others do not know where you live. IP addresses are equally important and indispensable to computers connected to the Internet. If the population of a residential area suddenly swells, many new houses will be built and what kind of house numbers will they be assigned to? No indiscriminate chaos, but also the preservation of the original sequence. Obviously there is room 901 and 902, Next to the new residential building named A 901 floor, B 901 floor and so on. Similarly, the face of rapidly expanding user base, the Internet will also encounter some problems IP address is not enough. We found that in the metropolitan area there are sometimes several buildings surrounded by walls with a common gate and a compound courtyard. The house number is different from other people in the residential area, you can define their own. The letters received by the household were sent by the postman to the communication room and then sent by the gatekeeper to the household. So at