Great Circle Associates Firewalls
(September 1995)
 

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Subject: Re: 5 bit subnet for Bastion
From: paul @ hawksbill . sprintmrn . com (Paul Ferguson)
Date: Fri, 15 Sep 1995 15:15:36 -0500 (EST)
To: dwaters @ RedBrick . COM (Dean Waters)
Cc: firewalls @ GreatCircle . COM
In-reply-to: <199509151809 . LAA11295 @ goofy . RedBrick . COM> from "Dean Waters" at Sep 15, 95 11:00:18 am

> 
> I don't know if this is the proper place for this but I will give it a try.
>

No, but what the hell.  :-)

 
> I am setting up a Livingston Firewall router and want to use only a small
> portion of one of our subnets for the unprotected host/hosts. It has been
> suggested that I use a 5-bit subnet for this. Is this feasible? If so does
> that mean I would use 1-32 for hosts on that subnet? Then what subnet mask
> would I use.
> 
> 

A 5 bit mask (255.255.255.248 with a classful 'c' network address) would
yield 30 useable subnets with 6 useable hosts on each subnet. Unless
you decide to use IP subnet 0, then the first subnet would remain
'reserved' and the first useable host address would be .9.

- paul


_______________________________________________________________________________
Paul Ferguson  		   			   Dulcius Ex Asperis 
US Sprint                                          tel: 703.689.6828
Managed Network Engineering                   internet: paul @
 hawk .
 sprintmrn .
 com
Reston, Virginia  USA                             http://www.sprintmrn.com 


References:
Indexed By Date Previous: Firewalls FAQ (Rev 8, updated Wed Sep 13 21:50:35 1995)
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From: Dean Waters <dwaters @ RedBrick . COM>
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From: lpierce @ intex . net (S. Lane Pierce)

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