Great Circle Associates Firewalls
(November 1996)
 

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Subject: Re: Subnetmasks
From: Laurie Bostic <Laurie_Bostic @ INS . COM>
Date: Fri, 15 Nov 1996 09:46:21 -0600
To: Dan . Johansson @ commentor . se (Dan Johansson)
Cc: firewalls @ greatcircle . com

At 02:08 PM 11/15/96 +0100, you wrote:
>Hi,
>
>I know this is a bit off topic, but here it goes.
>
>Can I split my C-class (xxx.yyy.zzz.0) network as follow?
>
>
>Net 1     +---------+   Net 2
>----------| Gateway |---------
>          +---------+
>               |
>               | Net 3
>               |
>
>Net 1: xxx.yyy.zzz.128 subnetmask 255.255.255.192
>       Hosts: xxx.yyy.zzz.129 - xxx.yyy.zzz.190
>
>Net 2: xxx.yyy.zzz.16 subnetmask 255.255.255.240
>       Hosts: xxx.yyy.zzz.17 - xxx.yyy.zzz.31
>
>Net 3: xxx.yyy.zzz.112 subnetmask 255.255.255.240
>       Hosts: xxx.yyy.zzz.113 - xxx.yyy.zzz.127
>

Yes, as long as your gateway/router is running an IP routing protocol that
supports variable length subnet masking (VLSM).  Common IGP's that support
this are OSPF (standard) and E/IGRP (cisco proprietary).

Hope this helps,
Laurie
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Laurie Bostic                     E-Mail : <mailto:laurie_bostic @
 ins .
 com>
 INS Dallas                        Pager  : 1-888-897-2430
 http://www.ins.com                V-Mail : (214) 392-0144 x176
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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