[AG-TECH] Re: Hands-on Multicast Workshop (fwd)

John Zwiebel jzwiebel at procket.com
Wed May 8 17:25:38 CDT 2002

On Wednesday, May 8, 2002, at 02:44 PM, Hans Kuhn wrote:

> John,
> Yes, and Yes. We would be happy to source SSM and ASM
> sources for the multicast workshop if we know that we will
> have at least one SSM joiner. Would that be you John ;) ?

I'd sure hope that Beau and Toerless and Shep would be pushing
that same thing.  If not, I'll have to get out my bat.  ;-)

Actually, what I was wanting was info I got from Ross where he said:

   There used to be an Internet Draft - 
   - that described how to (among other things) describe SSM sessions in 
         c=IN IP4
         a=incl:IN IP4

   I.e., in this example, the session uses the SSM address (,

IMHO the SDP can include the source even if it isn't in the SSM range.
That way an application that is smart enough could send an IGMPv3
report for that source and not have to worry about ASM.

(it makes sense to me for a one-to-many group which is what you
are going to be sending out.)

Thanks for considering it.

> Cisco has a nice SSM implementation in IP/TV at this point.
> IGMPv3lite is available for pre-windows-XP versions that
> don't support IGMPv3.
> Also, note that MIM 1.2 supports SSM for those unixes that
> have IGMPv3 support (read, FreeBSD). Linux and Solaris are
> still lagging, altho I have heard several people mention in
> private that they are working on IGMPv3 for these platforms.
> Hans
> --
> Hans Kuhn, Academic User Services	     office (541) 346-1714
> University of Oregon, 237 CC	             fax    (541) 346-4397
> Key fingerprint =  1E BC 32 03 AC E9 82 6C  44 4A CD 63 BB 2D 51 89
> ---------- Forwarded message ----------
> Date: Wed, 8 May 2002 14:17:12 -0700 (PDT)
> From: Lucy E. Lynch <llynch at darkwing.uoregon.edu>
> To: hak at darkwing.uoregon.edu
> Subject: Re: Hands-on Multicast Workshop (fwd)
> want to field this one?
> Lucy E. Lynch 				Academic User Services
> Computing Center			University of Oregon
> llynch at darkwing.uoregon.edu		(541) 346-1774/Cell: 912-7998
> ---------- Forwarded message ----------
> Date: Wed, 8 May 2002 14:13:03 -0700
> From: John Zwiebel <jzwiebel at procket.com>
> To: Lucy E. Lynch <llynch at darkwing.uoregon.edu>
> Cc: Brent Sweeny <sweeny at indiana.edu>, ag-tech at accessgrid.org,
>      wg-multicast at internet2.edu
> Subject: Re: Hands-on Multicast Workshop
> On Wednesday, May 8, 2002, at 02:03 PM, Lucy E. Lynch wrote:
>> You know, we just might ;-) it would be useful to have remote
>> joiners to test with - and to tell us multicast isn't working!
> If you do, will you be including enough info in the SDP
> announcement that apps and hosts capable of SSM can use it?
> (Has Cisco gotten the bugs out of their IP/TV SSM version?)
> Thanks

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