netdev - Re: multicast with multiple devices

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Message-ID: <alpine.LNX.1.10.0806051154300.29055@fbirervta.pbzchgretzou.qr>
Date:	Thu, 5 Jun 2008 11:54:54 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	David Stevens <dlstevens@...ibm.com>
cc:	netdev@...r.kernel.org
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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