Great Circle Associates Firewalls
(February 1997)
 

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From: "david.d.b.bolger@ .x400.entropy.ie"@entropy.entropy.ie
Date: 3 Feb 1997 01:38:54 -0800
To: firewalls @ GreatCircle . COM
Newsgroups: mail.firewalls

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Subject: RE(2): [FW1] FW logswitch on Windows NT 
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If you disable IP forwarding in NT, then if you wish to use it as a firewall, the packets destined for the other side will not even try to get to the firewall level.
You need to have IP forwarding on, and then let FW-1 control it or not.

===============================
David Bolger - Technical Engineer

Entropy Ltd.
Unit 25 
Sandyford Office Park
Dublin 18
Ireland

Tel: 	++353-1-2940199
Fax: 	++353-1-2940121
email:	David .
 Bolger @
 entropy .
 ie
===============================

---- owner-fw-1-mailinglist(a)us.checkpoint.com's Message ----



 
> The default for Firewall-1 is to 'control IP forwarding' which means
> that although the NT IP forwarding is enbaled packets WILL NOT be
> forwarded unless Firewall-1 permits.  I beleive this is true even when
> the Firewall-1 service is stopped due to the device driver changes to
> the IP stack made by Checkpoint.
> 
> Can anyone confirm this last point for me?
> 

The last point is true. However, it is better to disable ip forwarding 
capablity of NT (I'm quite dark in NT) so that the host would not be
able to forward ip even when FW-1 was unloaded from system.

Nobuhiko Yoshimoto
Nihon Keizai Shimbun Inc.
yoshi @
 nikkei .
 co .
 jp
phone:813-5690-0256
fax:813-5690-0250





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