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CIDR 的用處

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CIDR 的用處

可能的重複：
什麼是有類別尋址？

多年來，我一直聽說過“CIDR”這個詞，但從未認真思考過它。今天早上我仔細閱讀了維基百科文章讀完之後，我了解到 CIDR 實際上只是一種為網路（或網路上）產生 IP 位址的演算法。

這是一個公平的評估嗎？還是我錯過了大局？它還有其他主要用途嗎？

先致謝！

答案1

除了它在互聯網中的主要用途之外，它的另一個主要用途是分割大型企業網路的私有IP位址範圍

RFC1519說

Classless Inter-Domain Routing (CIDR):
         an Address Assignment and Aggregation Strategy

1.  Problem, Goal, and Motivation

   As the Internet has evolved and grown over in recent years, it has
   become evident that it is soon to face several serious scaling
   problems. These include:

      1.   Exhaustion of the class B network address space. One
           fundamental cause of this problem is the lack of a network
           class of a size which is appropriate for mid-sized
           organization; class C, with a maximum of 254 host
           addresses, is too small, while class B, which allows up to
           65534 addresses, is too large for most organizations.

      2.   Growth of routing tables in Internet routers beyond the
           ability of current software, hardware, and people to
           effectively manage.

      3.   Eventual exhaustion of the 32-bit IP address space.

   It has become clear that the first two of these problems are likely
   to become critical within the next one to three years.  This memo
   attempts to deal with these problems by proposing a mechanism to slow
   the growth of the routing table and the need for allocating new IP
   network numbers. It does not attempt to solve the third problem,
   which is of a more long-term nature, but instead endeavors to ease
   enough of the short to mid-term difficulties to allow the Internet to
   continue to function efficiently while progress is made on a longer-
   term solution.

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