[AG-TECH] inquiry on vic, rat, PIG

Jennifer Teig von Hoffman jtvh at bu.edu
Tue Apr 20 09:41:18 CDT 2004

Hi Dondon,

Sounds like a classic problem: issues with multicast networks. I'd 
suggest trying one of the venues with a unicast bridge to confirm this; 
there's basic information about using the bridge built into AG 2.x at:

If the bridge does the trick, that would indicate that you're having a 
problem with native multicast. If that's the case, you need to get your 
networking folks in the loop to sort this out, since it likely requires 
configuration changes on one or more routers. I'd suggest checking out 
the following online tutorial to learn more about troubleshooting 
multicast issues, so you can help pinpoint the problem and work 
effectively with your networking folks:

	Access Grid Multicast Network Troubleshooting:
	A Guide for Technical Users
	go to http://webct.ncsa.uiuc.edu:8900/public/AGIB/
	free registration is required
	after registering and logging in, follow link to general
	AG topics, and then to tutorial named above

- Jennifer

Dondon Carlos wrote:

> We are experimenting on a PIG setup (PIII 1GHz single processor, 512MB 
> RAM). Our network has multicast capability (we had tested with 
> the beacon server) and it's running on a link connection with a 
> bandwidth of 3xE1 (~6Mbps). This is the connection of the Philippines 
> outside. We had installed and run the AGTk2.1.2. We were able to connect 
> to the ANL venue server (and other venue servers as well e.g. APAG, 
> WESTGRID) and we were able to see the list of the participants there, 
> the shared applications and the shared browsers. THe problem we 
> encountered is that there were no video or audio signals reflected in 
> the Vic and Rat software (coming from other sites). We have done more 
> testings and the video and audio signals only came twice during our 
> testings i.e video/audio from other sites were reflected in our Vic/Rat 
> software only twice and then after that we can't receive them again 
> whenever we enter to venue servers and the rooms there. We followed the 
> instructions in PIG setup. 
> Did we miss a thing here? Thank you in advance. Have a nice day.    

More information about the ag-tech mailing list