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Date:      Thu, 28 Sep 2000 13:14:47 -0500
From:      "Charlie Schloemer" <charlie@infoworks.net>
To:        <freebsd-questions@FreeBSD.ORG>, "Dana" <akadanak@kc.rr.com>
Subject:   Re: Firewalls
Message-ID:  <200009281815.NAA16835@smtp.intop.net>
In-Reply-To: <043101c02972$d75bc4a0$449aa318@kc.rr.com>

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On 28 Sep 00, at 12:37, Dana wrote:

> I can't find any firewalls in the ports directories. What 
> firewalls are people using with freeBSD?
> 
> Dana

This is done in FreeBSD at the kernel level, and must be compiled 
into your kernel.  The FreeBSD Handbook available at 
www.FreeBSD.org has details on building a custom kernel, as well 
as adding the kernel options for firewalling.  Specifically, you're 
looking to add an option for IPFIREWALL and support for pseudo-
device bpf, which is the Berkeley Packet Filter.  Filtering rules are 
created with the stock /sbin/ipfw.  A good reference on ipfw is 
found firstly in the man pages, but www.FreeBSDDiary.com has 
some good, real-world examples of ipfw flexing its muscle.

-Charlie






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