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Date: Tue, 04 Sep 2001 16:04:06 +0900
From: "Qin, Li" <qinli@direct.ksp.nis.nec.co.jp>
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To: mark tinguely <tinguely@web.cs.ndsu.nodak.edu>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: FreeBSD 4.3 doesn't support multicast for IPv4 by default?
References: <200109031403.f83E3If75137@web.cs.ndsu.nodak.edu>
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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...

Thanks.

Qin Li


mark tinguely wrote:
> 
> A quick test with tcpdump on FreeBSD 4.3-RELEASE shows that the
> ping gets sent out the primary multicast network port:
> 
> $ ping 224.1.1.1
> 
> # tcpdump -n -i tx0 net 224
> tcpdump: listening on tx0
> 08:55:54.643167 127.10.10.10 > 224.1.1.1: icmp: echo request [ttl 1]
> 08:55:55.652619 127.10.10.10 > 224.1.1.1: icmp: echo request [ttl 1]
> 08:55:56.662630 127.10.10.10 > 224.1.1.1: icmp: echo request [ttl 1]
> 08:55:57.672646 127.10.10.10 > 224.1.1.1: icmp: echo request [ttl 1]
> 08:55:58.682659 127.10.10.10 > 224.1.1.1: icmp: echo request [ttl 1]
> 
> I believe that certain ICMP messages are not suppose to be sent in
> reply to multicasts. Check to see if any other hosts on the network
> are recieving and replying to the echo request.
> 
> --mark tinguely.

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