[AG-TECH] Outside AV not working

[Thomas D. Uram]

Hi Don:

I believe (based on other conversations with you) that you're using multicast addresses 
similar to 224.0.0.x on your server.  This is, apparently, a problem.

 From the cisco Guidelines for Enterprise IP Multicast Address Allocation 
(http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00802d4643.shtml), it 
looks like you should avoid 224.0.0.0-224.0.0.255, which "is used by network protocols on 
a local subnet segment".

This same document claims that the 'global' range is 224.1.0.0-238.255.255.255, so 
addresses there should work for you.  There are more details in RFC3171, if you're interested.

Let us (ag-tech) know if this fixes your problem.

Tom


Donald Roeber wrote:
> We're running the latest AccessGrid Toolkit on MacOS X, as both a 
> VenueServer and a UniCast Bridge for that VenueServer.  The server is 
> multicast enabled, and so are clients on the upenn.edu network.  Clients 
> on the upenn.edu network can connect to the VenueServer and use RAT and 
> VIC just fine.  Unfortunately, for people outside of the Penn network, 
> audio and video doesn't work, but they can still use the text chat built 
> into the VenueClient.  We don't have any firewalls or anything like that 
> in place.  Because of a bug in the MacOS X version of the AGToolKit 
> we're using manual multicast addressing for each venue.  Each venue is 
> assigned a unique IP address for audio and video, and a unique even 
> numbered port number for each service as well.
> 
> Any help would be greatly appreciated.