From owner-freebsd-questions  Fri Aug 31  7:53:18 2001
Delivered-To: freebsd-questions@freebsd.org
Received: from web.cs.ndsu.nodak.edu (web.cs.ndsu.NoDak.edu [134.129.125.7])
	by hub.freebsd.org (Postfix) with ESMTP id D545637B401
	for <freebsd-questions@FreeBSD.ORG>; Fri, 31 Aug 2001 07:53:15 -0700 (PDT)
Received: (from tinguely@localhost)
	by web.cs.ndsu.nodak.edu (8.11.4/8.11.4) id f7VErEJ57679;
	Fri, 31 Aug 2001 09:53:14 -0500 (CDT)
	(envelope-from tinguely)
Date: Fri, 31 Aug 2001 09:53:14 -0500 (CDT)
From: mark tinguely <tinguely@web.cs.ndsu.nodak.edu>
Message-Id: <200108311453.f7VErEJ57679@web.cs.ndsu.nodak.edu>
To: freebsd-questions@FreeBSD.ORG, qinli@direct.ksp.nis.nec.co.jp
Subject: Re: FreeBSD 4.3 doesn't support multicast for IPv4 by default?
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-questions.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-questions>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-questions>
X-Loop: FreeBSD.ORG


FreeBSD and almost all network cards support Multicast by default.

The only kernel changes that are required is when you want to run
a Multicast router on the machine.

most likely you have a firewall rule that is blocking multicast from
being sent and recieved.

if you do not have any firewall rules enabled, run tcpdump on the interface
and then start a mulitcast program (sdr, vic, vat, rat). The multicast
program will make an announcement to the network that it has joined the
group that you should see on the tcpdump.

--mark tinguely.

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message