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Date:	Thu, 5 Jun 2008 11:54:54 +0200 (CEST)
From:	Jan Engelhardt <>
To:	David Stevens <>
Subject: Re: multicast with multiple devices

On Monday 2008-05-26 19:26, David Stevens wrote:

>Most multicast applications don't use the routing table at all. Instead,
>you should specify the particular interface you want, since the same
>group number on different interfaces often isn't the same group.
>You can use IP_MULTICAST_IF, SO_BINDTODEVICE, etc., and 
>of course specify the interface in the IP_ADD_MEMBERSHIP call
>for listeners.

But what if you do not have an application to begin with?
Does not the kernel do autonomic forwarding of multicast
like it does for unicast?
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