From owner-freebsd-questions@FreeBSD.ORG  Sun Jan 25 06:59:49 2004
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id BC1EC16A4CE
	for <freebsd-questions@freebsd.org>;
	Sun, 25 Jan 2004 06:59:49 -0800 (PST)
Received: from mail.gmx.net (mail.gmx.de [213.165.64.20])
	by mx1.FreeBSD.org (Postfix) with SMTP id 35B6D43D45
	for <freebsd-questions@freebsd.org>;
	Sun, 25 Jan 2004 06:59:48 -0800 (PST)	(envelope-from pons@gmx.li)
Received: (qmail 11288 invoked by uid 65534); 25 Jan 2004 14:59:45 -0000
Received: from unknown (HELO pons) (194.165.152.7)
  by mail.gmx.net (mp016) with SMTP; 25 Jan 2004 15:59:45 +0100
X-Authenticated: #2607275
Message-ID: <024201c3e353$e3ac0c80$0503050a@sdc.com.jo>
From: "Pons" <pons@gmx.li>
To: <freebsd-questions@freebsd.org>
References: <20040125144542.15702.qmail@web13905.mail.yahoo.com>
Date: Sun, 25 Jan 2004 16:59:51 +0200
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2800.1158
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
Subject: IPFW
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 25 Jan 2004 14:59:49 -0000


I have configured a FreeBSD 5.1 rel box 2 NIC's (Ext.ip/Int.ip)
with ipfw/natd/squid the setup is working, but still _FLAT_
it means i am using the default IPFW configuration
firewall_type="open"
I want to give more security to my internal network by
stoping/limiting unneccessary traffic in/out
so I need help to implement the following set of ipfw rules
1- permit only clients with 10.5.0.0/16 to send/recv via the box
2- Block MSN messanger/ yahoo messanger/ ICQ / Kazaa
3- Block in/out ICMP Ping / traceroute
4- Permit DNS/ HTTP(S)/ FTP / SMTP / Telnet /SSH /POP3
5- what should i include in  /etc/sysctl.conf against DoS attack , spoof
..etc
6- What about the kernel_level, in which mode should i run the kernel
7- which other services should i disable
8- allow me (my ip) to manage the box by accessing it via ssh only
any input would be really appreciated.
Thanks