Great Circle Associates Firewalls
(April 1997)
 

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Subject: Re: NAT and subnet masking
From: ö PaLaN ö <palan @ dataprep . com . my>
Date: Fri, 25 Apr 1997 10:10:49 -0800
To: "W. Joseph Steinert" <wjsteinert @ ccr . com>
Cc: firewalls @ greatcircle . com

At 11:03 AM 4/24/97 -0400, you wrote:
>We have a client who has a Class A network that the would like to use
>FW_HIDE to translate. The twist is that they are using a class B subnet
>mask on this class A network. Does anyone see a problem with the
>translation or should it work OK. Thanks for your help.
>

Hi,

It should work. I have just finished a network implementation fo my client
who uses Class A address with Class C subnet for thier WAN and LAN. I uses
the same FW_HIDE option and it works fine but you may face a problem ehn
trying to ping. This is due to the bug in FW-1 Version 2.0 which the FW_HIDE
feature only allows services with port numbers. So ICMP doesn't use any
ports. Hope this helps ....

** Anybody to correct me ??

Rgds,
PaLaN

Network Security Engineer/Consultant
West Malaysia.

" Hey ! Here is my key ... Lets exchange packets now !! "


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