Re: MLDv1 still in the wild?

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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