From owner-freebsd-questions@FreeBSD.ORG  Tue Apr 19 01:24:17 2005
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 6A29816A4CE
	for <freebsd-questions@freebsd.org>;
	Tue, 19 Apr 2005 01:24:17 +0000 (GMT)
Received: from mail.cs.ait.ac.th (mail.cs.ait.ac.th [192.41.170.16])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 43F4243D1F
	for <freebsd-questions@freebsd.org>;
	Tue, 19 Apr 2005 01:24:15 +0000 (GMT)	(envelope-from on@cs.ait.ac.th)
Received: from banyan.cs.ait.ac.th (banyan.cs.ait.ac.th [192.41.170.5])
	by mail.cs.ait.ac.th (8.12.11/8.12.11) with ESMTP id j3J1NuVG094029
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 19 Apr 2005 08:23:56 +0700 (ICT)
Received: (from on@localhost)
	by banyan.cs.ait.ac.th (8.13.1/8.12.11) id j3J1Nsxj032851;
	Tue, 19 Apr 2005 08:23:54 +0700 (ICT)
Date: Tue, 19 Apr 2005 08:23:54 +0700 (ICT)
Message-Id: <200504190123.j3J1Nsxj032851@banyan.cs.ait.ac.th>
From: Olivier Nicole <on@cs.ait.ac.th>
To: jpp@cloudview.com
In-reply-to: <42643F94.7020903@cloudview.com> (message from John Pettitt on
	Mon, 18 Apr 2005 16:15:32 -0700)
References: <42643F94.7020903@cloudview.com>
X-Virus-Scanned: on CSIM by amavisd-milter (http://www.amavis.org/)
cc: freebsd-questions@freebsd.org
Subject: Re: Multicast and security
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: Tue, 19 Apr 2005 01:24:17 -0000

> I'm looking at adding MROUTING to my gateway/firewall box (Soekris
> 4801 running 5.4 RC2).  However having not played with multicast
> before I'm looking for pointers on the security issues (I don't want
> to create a gaping hole in my FW).

It depends on how your ISP is doing his multicast routing. Here we are
using PIM and it means:

PIM proto 103 from router to router and from router to 224.0.0.13/32

IGMP proto 2 from client to 224/4

UDP from client to 224/4

Olivier