[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [AG-TECH] multicast issues in Walkabout

It's possible for there to be per-multicast-group weirdness in the routing infrastructure, since the presence of multicast data on the network creates state in the routers to handle the transmission of that data.

We actually ran into this quite a bit in the early AG days.

--bob

On Dec 7, 2005, at 9:49 AM, monika.k.rabarison@ccaix.jsums.edu wrote:

Dean,

Once upon a time, we had similar issues. The person who did
the troubleshooting
asked me about the multicast group and the range of ports
used by all the venues.
Not sure about what he did but the problem was resolved.

-Monika




    Ghosts in the machine ... It's the ghost of Steve
Deering wandering the  virtual venues ... Oh, wait, he's
not dead.

    I dunno then.

    Derek

/Steve Deering invented multicast

Michael Daw wrote:


I too have seen problems in certain venues but not in


others. Several people more knowledgable than me have
denied that this is possible until they've seen it
demonstrated. But then they just look mystified rather


than being able to come up with an explanation!



-----Original Message-----
From: owner-ag-tech@mcs.anl.gov
[mailto:owner-ag-tech@mcs.anl.gov] On Behalf Of Dean W.


Nobles >>Sent: 06 December 2005 21:20


To: ag-tech@mcs.anl.gov
Subject: [AG-TECH] multicast issues in Walkabout

Hey, this is Dean Nobles at TACC.   Is it possible for a
specific venue
on a venue server to have multicast issues?  Almost


every time that we >>use the Walkabout venue, we
experience problems that appear to be >>multicast related.
 We don't see similar problems on other  >>venue servers


nor even other venues on the NCSA venue server.

--dean









--
Derek Piper - dcpiper@indiana.edu - (812) 856 0111
IRI 323, School of Informatics
Indiana University, Bloomington, Indiana