Great Circle Associates Firewalls
(February 1998)
 

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Subject: RE: Firewalls-Digest V7 #51
From: reilly <rich . friedeman @ anixter . com>
Date: Tue, 03 Feb 1998 15:52:22 -0600
To: firewalls @ greatcircle . com

>
>Is this on an NT server? If so, IP forewarding opens up a large hole inside 
>any security perimeter. Although I am not familiar enough with Checkpoint 
>to know how it intercepts packets, I am surprised that they say that 
>forewarding must be active. Even Microsoft states that when using thier MS 
>proxy server, that IP forewarding MUST be disabled.
>
>
>
under version 3.x of FW-1 on NT, IP forwarding must be enabled.  That makes
the NT server think it's enough of a router to be able to pass packets
between two networks.  When you install FW-1, you are asked whether you
want FW-1 to control routing...the answer is absolutely _yes_.  This
disables NT routing when the firewall inspection module is not actually
running, as I understand it.  So somebody does and 'fwstop', routing stops.
 All packets are passed through the inspection engine.

Reilly

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