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Date:      Tue, 28 Aug 2001 10:23:00 -0400
From:      Mark Woodson <mwoodson@bacxs.com>
To:        <questions@freebsd.org>
Subject:   Re: Security !
Message-ID:  <5.1.0.14.0.20010828101902.026900a0@192.168.99.2>
In-Reply-To: <62d801c12fc9$e3edd0b0$0a05030a@internal.ramnet.gr>

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At 05:01 PM 8/28/2001 +0300, midiostri@in.gr wrote:
>Hi,
>
>I'm busy securing our LAN and I need to setup a freebsd 4.3 box that will 
>run as firewall and protect my vulnerable network from the internet chaos. 
>I also think of running NAT there too.
>
>There appear to be quite a lot of hackers and intruders in the wild and I 
>need to keep them out of my lan.
>
>I'd appreciate any suggestions or links/references to stuff that can help 
>me on this.

The first thing I could suggest would be to get yourself a good 
book.  "Building Internet Firewalls" published by O'Reilly is a good place 
to start.

Next you'll need to learn about Unix/BSD so that you can properly secure 
your box.

Then pick a filtering/NAT product.  I use IP Filter/NAT.

Then finally build your firewall.

>Also, are there any scripts that can be run periodically on a computer and 
>check if there are changes made to files ?

Tripwire, you'll find it in the ports collection.

/usr/ports/security/tripwire

Start with a good book on security and/or firewalls.

-Mark



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