G'day Satya Generally speaking, the Access Grid uses the network protocol "Multicast" by default to enable communication between "joined" parties.
You might find the following document http://www.accessgrid.org/firewall-doc useful. I am not 100% sure whether the AG supports " Source Specific Multicast ", but I simply know that the AG by default uses the multicast protocol (whether this is Source Specific or not - I am not sure, haven't heard the use of that terminology much before). In regards to your problems, I suspect that the issue is more related to audio device and configuration. You could conduct some self-testing on each of your Access Grids to assist with trouble shooting. I suggest you have a look at http://www.accessgrid.org/qa-improve, as it provides some practical examples on testing Access Grid systems. Additionally, you may wish to attend the ASIA-Pacific weekly test session to receive feedback about your Access Grid from other AG users. Details for the session are as follows: When: Every Monday Time: Bangkok 8.00am Beijing 9:00am Manila 9.00am Singapore 9.00am Taipei 9.00am Perth 9.00am Seoul 10.00am Tokyo 10.00am Brisbane 11.00am Adelaide 11.30am Canberra 12.00pm Hobart 12.00pm Melbourne 12.00pm Sydney 12.00pm Auckland 2.00pm Venue: APAG Lobby -> AG-EVO@AU Bridge Lobby -> EVO-AG Testing Room (https://130.102.78.178:8000/Venues/ac10cd0111eb76b4d3d7bb213a5aa975b) Version: AG3 Additionally, some presentation material, including AG testing and network information can be found http://www.arcs.org.au/index.php/component/content/article/77-video-collaboration/390-video-collab-pres. Anyway - I hope helps you with solving your problems. Cheers, Jason. -----Original Message----- From: ag-tech-boun...@lists.mcs.anl.gov [mailto:ag-tech-boun...@lists.mcs.anl.gov] On Behalf Of N. Satyanarayana Sent: Tuesday, 1 February 2011 03:00 PM To: ag-t...@mcs.anl.gov Subject: [AG-TECH] Bidirectional video/audio conference problem Hi, We are facing problem in realizing two way interaction with Access grid. We have a dedicated network across three different cities with multicast enabled in our routers. I believe each venue can be configured with only one multicast group ip address with separate ports for video and audio transmission. The network provider is saying that a node cannot be source as well as receiver at the same time but in AG it is observed that all the hosts participating in a particular venue session are transmitting both audio and video. He is saying it is not the right way of experimenting bidirectional communication thru audio/video. He is asking whether AG supports Source Specific Multicast or not, because he is saying bidirectional communication thru audio/video can be realized only thru SSM support. But i did not find any means on how to configure SSM in access grid. I am using AG 3.1 all in one windows installer. Some times we are facing audio echo and some times noise problem. I am not able to understand whether it is because of audio devices or network configuration. Can you throw some light on where the problem could be as we are not able to conclude whether it is due to network or audio devices. Regards, Satya -- N. Satyanarayana Centre for Development of Advanced Computing (C-DAC) No. 1, Shivbagh Ameerpet Hyderabad - 500 016 (Off) +91-40-23737124/25 http://www.cdachyd.in/econtentquality -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
