>why would this be needed?
>
>30 bits works perfect for serial links...  Am I missing something?\

It wastes two bits with every subnet. IPv4 address space is not an 
infinite resource.

>
>>>>  "Karen Young"  10/31/01 02:03PM >>>
>Currently you can't use /31 networks. However, there is an RFC that
>proposes changes that would allow their use on point-to-point links only.
>
>RFC 3021 Using 31-Bit Prefixes on IPv4 Point-to-Point Links. A. Retana,
>R. White, V. Fuller, D. McPherson. December 2000. (Format: TXT=19771
>bytes) (Status: PROPOSED STANDARD)
>
>Just an FYI,
>Karen
>
>
>>>>>>>>>>>>>>>>>>> Original Message  Good...... but you can't have a subnet
>with 31 bits.... that would leave
>2
>>  "hosts" and the network address and the broadcast would use them up, so
>you
>>  end up with 0 hosts per subnet.  For point-to-point serial links, you'd
>>  usually use a /30 (255.255.255.252) which gives you 4 addresses per
>subnet
>>  (1 network, 1 broadcast, and two hosts)
>
>>  Mike W.




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