On Wed, 21 May 2008, Kendall Shaw wrote:
>In the networking section of the OpenBSD FAQ it suggests reading
>"Understanding IP addressing":
>
>http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf
>
>I'm having a hard time understanding it. In many places they use 2
>numbers, e.g. 2(21) or 232 (4,294,967,296). Can you understand what they
>are saying?
>
>For example, on page 3:
>
>"IPv4 defines a 32-bit address which means that there are
>only 232 (4,294,967,296) IPv4 addresses available."
>
>232 what?
>
>On page 11:
>
>"The first step in the planning process is to take the maximum number of
>subnets required and round up to the nearest power of two. For example,
>if an organization needs nine subnets, 23 (or 8) will not provide
>enough subnet addressing space, so the network administrator will
>need to round up to 24 (or 16)."
>
>23 or 8 what? Bits? What are 23 and 8 alternatives of? 24 or 16 looks
>like alternative prefix lengths for class A or B networks, but I don't
>get 23 or 8.
Somewhere along the line the exponentiation operator (^) has been
dropped from the text. 232 should be 2^32, 23 should be 2^3, 24 should
be 2^4, etc.
Dave
--
Dave Anderson
<[EMAIL PROTECTED]>
