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Date:      Fri, 10 Aug 2001 16:08:48 -0500
From:      Jon Loeliger <jdl@jdl.com>
To:        Krzysztof Zaraska <kzaraska@student.uci.agh.edu.pl>
Cc:        security@FreeBSD.ORG
Subject:   Re: IPFW Dynamic Rules 
Message-ID:  <E15VJWU-000J6t-00@jdl.com>
In-Reply-To: Your message of "Fri, 10 Aug 2001 14:23:56 %2B0200." <Pine.BSF.4.21.0108101308460.63404-100000@lhotse.zaraska.dhs.org> 

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So, like Krzysztof Zaraska was saying to me just the other day:
>
> [ ... ]
> 
> Generally I construct firewall rules like this:
> 1. deny everything
> 2. allow all connections from inside to outside world. TEST. 
> 3. allow the outside world to connect to selected services. TEST. 
> 4. TEST. Specifically check if no unwanted connections may be initiated
> from outside. 

Krzysztof,

This was one of the most enlightening and helpful explanations
of IPFW and packet filtering I've read anywhere!

Thanks for the insight and help!

jdl


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