[AG-TECH] multicast issues in Walkabout

[Robert Olson]

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 at 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 at mcs.anl.gov
>>>> [mailto:owner-ag-tech at mcs.anl.gov] On Behalf Of Dean W.
>>>>
>> Nobles >>Sent: 06 December 2005 21:20
>>
>>>> To: ag-tech at 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 at indiana.edu - (812) 856 0111
>> IRI 323, School of Informatics
>> Indiana University, Bloomington, Indiana
>>
>
>