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Date:      Sun, 4 Mar 2001 10:01:48 -0600
From:      Mike Meyer <mwm@mired.org>
To:        "Ted Mittelstaedt" <tedm@toybox.placo.com>
Cc:        questions@freebsd.org
Subject:   RE: FreeBSD Firewall vs. Black Ice
Message-ID:  <15010.26348.659989.455852@guru.mired.org>
In-Reply-To: <8738640@toto.iv>

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Ted Mittelstaedt <tedm@toybox.placo.com> types:
> Where firewalling gets costly, as in sucking up your time or paying someone
> else, is when you want to have your cake and eat it too - ie: you want to be
> protected, but you also want to offer services or do different things, and
> you also want the firewall to be invisible to you, from the inside.

This is why you run two firewalls.  One does little more than your
basic $100 Linksys box, and sits between your internal network and the
rest of the world. Your service boxes sit outside of it, in the
dmz. The second firewall sits between those and the internet
proper. No connections go from the outside world to the internal
network (and very little from the dmz to the internal network). You
then set the world up so that the service boxes are *generated* from
data on the internal box. Not backed up, but built. When one of the
goats gets compromised, you close the hole in the build data, install
a new OS and rebuilt from the internal data.

> >Personally I'ld rather err on the safe side, but MicroSoft has shown
> >by its continued existence that the world thinks otherwise. IOW MS
> >grocks the world, sad as it may be.
> Remember that Microsoft products are designed for internal corporate use,
> not external Internet server production use.  Internal corporate networks
> are generally more friendly than the public Internet.

That isn't sufficient explanation for their continuing to ship LookOut
with the virus-enabling - uh, script-enabling - tools turned on by
default. Unless you disallow external mail, you get as much exposure
to mail problems inside as you do outside.

	<mike
--
Mike Meyer <mwm@mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

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