Re: Subnetting Class C IP networks

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Article #53

#53

From: WENDELL S. READ
Date: Mon, 07 Mar 1994 13:36

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In article <CM5JM7.D19@cup.hp.com> mintz@cup.hp.com (Ken Mintz) writes:
>From: mintz@cup.hp.com (Ken Mintz)
>Subject: Re: Subnetting Class C IP networks
>Date: Fri, 4 Mar 1994 18:06:07 GMT

>Mark Landin (landin@cherokee.nsuok.edu) wrote:
>> Can you subnet a Class C address, say by using a mask like 255.255.255.128?

>  Not 128 specifically, but certainly other values, such as 192, 224 etc.
>  The problem with 128 per se is that that creates a one-bit subnet id.
>  Since all-zero and all-one values have special meaning, subnet id and host
>  id fields must comprise at least __two__ bits each.

>-- Ken Mintz

>PS:  Some implementations do permit one-bit subnet ids, but this is non-
>conformant.
We have been using the mask 255.255.255.224 with complete sucess.  This gives
us 6 subnets with 30 hosts each.

Wendell Read

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References: <1994Mar4.142909.12080@cherokee.nsuok.edu> <CM5JM7.D19@cup.hp.com>

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From: wsread@science.remnet.ab.com (WENDELL S. READ)
Subject: Re: Subnetting Class C IP networks
Message-ID: <wsread.3.000D9A5A@science.remnet.ab.com>
Keywords: subnet
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References: <1994Mar4.142909.12080@cherokee.nsuok.edu> <CM5JM7.D19@cup.hp.com>
Date: Mon, 7 Mar 1994 13:36:05

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