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Date:      09 Apr 1999 15:44:47 +0200
From:      Dag-Erling Smorgrav <des@flood.ping.uio.no>
To:        Pavlin Ivanov Radoslavov <pavlin@catarina.usc.edu>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: IGMP membership report not received by mrouted
Message-ID:  <xzplng1oqls.fsf@flood.ping.uio.no>
In-Reply-To: Pavlin Ivanov Radoslavov's message of "Thu, 08 Apr 1999 20:35:53 -0700"
References:  <199904090335.UAA23923@hugo.usc.edu>

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Pavlin Ivanov Radoslavov <pavlin@catarina.usc.edu> writes:
> If I start mrouted (3.9-beta3+IOS12), mrouted cannot see the IGMP
> membership reports. If I start tcpdump on the interface with
> receivers, then mrouted can see the IGMP membership reports!!
> No other mrouted running on neighbor machines.

Starting tcpdump puts the interface in promiscuous mode. It sounds to
me like a) the NIC driver is incorrectly discarding multicast packets
when not in promiscuous mode, or b) mrouted uses bpf but forgets to
put the interface in promiscuous mode. I'm not familiar with mrouted,
but my take is that b) is the likeliest scenario.

DES
-- 
Dag-Erling Smorgrav - des@flood.ping.uio.no


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