[Mobopts] Re: mmcastv6-ps Draft

Thomas C Schmidt <schmidt@informatik.haw-hamburg.de> Mon, 17 September 2007 11:00 UTC

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Date: Mon, 17 Sep 2007 13:04:22 +0200
From: Thomas C Schmidt <schmidt@informatik.haw-hamburg.de>
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Subject: [Mobopts] Re: mmcastv6-ps Draft
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Hi Stig,

thanks - and sorry for answering late ...

Stig Venaas wrote:
> I've had a quick read through the document now, and it looks quite
> good. I can't really think of anything to add or change. But I have
> one comment below.
> Worth mentioning scoped multicast? Using tunnel from HA you can when
> leaving your site continue receiving multicast from your site of
> site-local scope. If you join natively you will instead receive
> whatever that multicast group might be used for in the other site...

Yes, but there are issues to that: People tend to consider this a 
security fraud, if you participate in link-local group while being away 
(3775 says "should not be tunneled").

> Also, it might be important for a source sending scoped multicast to
> detect that it is no longer in the same scope zone. These are hard
> problems, and maybe not worth addressing...
We can mentioned this - even though I don't know any elegant solution to 
it. Regional scoping requires non-local knowledge, which usually is not 
available at the mobile source, I suppose.

> After writing the above I saw that you did briefly mention scoping as
> well. Your current text might be sufficient.
> The L2 discussion is quite useful. It could possibly have been a
> separate document, but I think it's fine here as well.
Many thanks :-)

Hope everything is fine at yours!

Best wishes,


° Prof. Dr. Thomas C. Schmidt
° HAW Hamburg, Dept. Informatik
° University of Applied Sciences
° Berliner Tor 7, D 20099 Hamburg
° Germany, Fon: +49-40-42875-8157
° http://www.informatik.haw-hamburg.de/~schmidt

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