From owner-freebsd-questions  Tue Sep  4  6: 8:45 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 3FF9337B405
	for <freebsd-questions@FreeBSD.ORG>; Tue,  4 Sep 2001 06:08:41 -0700 (PDT)
Received: (from tinguely@localhost)
	by web.cs.ndsu.nodak.edu (8.11.4/8.11.4) id f84D8eS80775;
	Tue, 4 Sep 2001 08:08:40 -0500 (CDT)
	(envelope-from tinguely)
Date: Tue, 4 Sep 2001 08:08:40 -0500 (CDT)
From: mark tinguely <tinguely@web.cs.ndsu.nodak.edu>
Message-Id: <200109041308.f84D8eS80775@web.cs.ndsu.nodak.edu>
To: qinli@direct.ksp.nis.nec.co.jp, tinguely@web.cs.ndsu.nodak.edu
Subject: Re: FreeBSD 4.3 doesn't support multicast for IPv4 by default?
Cc: freebsd-questions@FreeBSD.ORG
In-Reply-To: <3B947CE6.54DF274E@direct.ksp.nis.nec.co.jp>
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


> I've tried several other hosts on the network, only got icmp echo reply from
> those installed with FreeBSD 2.2.8-RELEASE. That's why I wonder if 4.3 doesn't
> support multicast for IPv4 at first, some customized configuration might be
> needed...

as root:

# sysctl -w net.inet.icmp.bmcastecho=1

the default is 0 and in sys/netinet/ip_icmp.c if this value is zero the
multicast and broadcast pings are dropped. I suspect the localhost hast
to be in promiscuous mode or subscribe to the multicast group to get the
echo request/reply.

--mark tinguely.

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