Message-ID: <93F527C91A6ED411AFE10050040665D00241AB10@corpusmx1.us.dg.com>
From: berthiaume_wayne@emc.com
To: ak@suse.de
Cc: linux-kernel@vger.kernel.org
Subject: RE: Multicast Broadcast
Date: Mon, 26 Nov 2001 11:33:03 -0500
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Sender: linux-kernel-owner@vger.kernel.org

	Wouldn't the IP address for the two NIC's have to be different for
that to work? I'm binding the same VIP to the two eth's.

-----Original Message-----
From: Andi Kleen [mailto:ak@suse.de]
Sent: Monday, November 26, 2001 11:16 AM
To: berthiaume_wayne@emc.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: Multicast Broadcast


berthiaume_wayne@emc.com writes:

> 	One potential work-around is a patch to
> net/ipv4/igmp.c:ip_mc_join_group.
> For example:
> 
> #ifdef DUAL_MCAST_BIND
>    if(!imr->imr_ifindex) {
>       imr->ifindex=2;  /* eth0 */
>       err=ip_mc_join_group(sk, imr);
>       if (!err) {
>         imr->ifindex=3; /* eth1 */
>         err=ip_mc_join_group(sk, imr);
>       }
>       return err;
>    }
> #else
>    if(!imr->imr_ifindex)
>      in_dev = ip_mc_find_dev(imr);
> #endif
> 
> 	I'm hoping that there is another way.

It depends on what you want to do, but this "fix" is the same
equivalent to executing IP_ADD_MEMBERSHIP twice with 2 and 3 in the
imr_ifindex field (except that the later doesn't break any programs) 

-Andi
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