All things related to multicast

["Mike McRoberts" <>]

Please take me off this list serve.

Mike McRoberts


----- Original Message ----- 
From: "Bob Riddle" <>
To: "Nicholas J Humfrey" 
<>
Cc: "Stig Venaas" <>; "wg-multicast" 
<>
Sent: Friday, July 06, 2007 7:14 AM
Subject: Re: VLC + Vista Multicast Issues


> The problem I experienced when WinXP only supported IGMPv3 involved an 
> edge router that supported IGMPv3 and a switch that did not support 
> IGMPv3.  This allowed the WinXP machine to "join" the multicast stream but 
> the switch threw away all the "keep-alive" messages from the router.  As 
> long as you only needed to watch a few minutes of the multicast stream, 
> everything worked fine   :-) .
>
> When I set up a linux machine using IGMPv2 to listen to the stream on that 
> switch, it "kept alive" the stream.   Lots of weird debugging involved, so 
> good luck!
>
> Stig Venaas wrote:
> > Nicholas J Humfrey wrote:
> > > Yes, I wasn't expecting this behaviour, but it certainly seems to 
> > > happen. Could this be a known Cisco bug? Does it keep group membership 
> > > state in a single table or multiple tables for each IGMP version?
> >
> > At least I haven't seen any such issues with Cisco. Rather than guessing
> > where the bug might be, try to do some debugging. First thing I would do
> > is tcpdump/wireshark to see which IGMP messages each of the hosts
> > receive and send, also check the IGMP state on the router for the
> > relevant groups, and if possible the IGMP state on the host for that
> > group. I don't know how much info you can get out of Mac OS X and
> > Vista...
> >
> > Stig
>
> --
> Bob Riddle (bdr @ umich.edu)            Enabling Technologies
> University of Michigan Medical School   1301 Catherine Street
> M4101 MSB1 - 6024                       Ann Arbor, Michigan  48109-0624
>
> "Math illiteracy affects 7 out of every 5 people"