RE: vlsm subnetting

From: jblicn (jblicn@yahoo.com.cn)
Date: Wed Apr 09 2003 - 12:44:16 EST


I think the number of hosts in a subnet should be 2^n, So it can not
be 191 or 192.

Jiangbo Li

> -----Original Message-----
> From: linux-net-owner@vger.kernel.org
> [mailto:linux-net-owner@vger.kernel.org] On Behalf Of Frank Brodbeck
> Sent: Wednesday, April 09, 2003 1:19 PM
> To: linux-net@vger.kernel.org
> Subject: vlsm subnetting
>
>
> Hi list,
>
> I'm stucked here with variable length subnet masks.
>
> Well I've gone through the rfc1878, googled a bit around, read through
> the TCP/IP Networking Administration by Craig Hunt (okay I
> must confess
> it's ``just" the german translation) and read a pile of eMails in your
> list's archive with no result except that I'm confused...
>
> Here's the detail:
>
> I'm having here a class C network which I want to split into unequal
> parts. Starting point is 172.25.156.0/24
> Well I just thought *no problem* and started to split the whole net
> via vlsm into the following parts:
>
> net broadcast hosts range mask*
> 172.25.156.0 172.25.156.192 1-191 255.255.255.0
> 172.25.156.193 172.25.156.223 194-222 255.255.255.192
> 172.25.156.224 172.25.156.239 225-238 255.255.255.224
> 172.25.156.240 172.25.156.255 241-254 255.255.255.240
> ------------
> (*) I'm pretty sure that this is completely rubbish but see it as a
> symbol of my confusion
>
> I guess I got the part, that a vlsm of 255.255.255.128 would divide my
> class C into two subnets of each 126 hosts and that a vlsm of
> 255.255.255.192 would do the same with 4 subnets each with a max. of
> 62 hosts.
>
> So if somebody could mind and bring some light in here I'd be
> thankful.
>
> HAND
> Frank.
> --
> Frank Brodbeck System administrator apprentice
> oakenshield@gmx.net University of Karlsruhe
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