On 2/29/2012 2:10 PM, Stig Venaas wrote:
[...]
I think the main reason OpenBSD and NetBSD don't support SSM is
Apple's IPR claim. Without SSM support, there is little reason to
support MLDv2.
I got some questions about this. See
http://www.ietf.org/ietf-ftp/IPR/APPLE-SSM.txt
See also e.g. http://marc.info/?l=snap-users&m=120819051424142
KAME did not add IGMPv3/MLDv2 to *BSD because of this. And as
a result Mac OS X did not have IGMPv3/MLDv2 until recently.
I'm not totally sure of the latter, but it is my understanding
the latest OS X has full support.
Stig
I'm a bit curious about the reason for the question. At least MLDv2
routers are supposed to support MLDv1 compatibility mode.
However, RFC 5790, on Lightweight IGMP/MLD makes it easy to support
SSM. I think there is open source support for 5790 somewhere.
What it does is basically removing exclude mode for a non-empty
source list. It is still a lot of work compared to IGMPv2/MLDv1.
Apart from hosts in general, I can imagine a lot of special purpose
devices that never needs SSM to only implement MLDv1.
Stig
Behcet
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