[AG-TECH] Using a bridge

Fred Dech fdech at uchicago.edu
Wed Jul 20 08:31:29 CDT 2005

also, if you bridge in yourself, you can see what ports are being used
by the bridgeserver, although it may use different ports for a second
bridge... i've not tested two bridged connections for a while.
some bridgeservers have a wide range of ports that they choose, depending
on the bridge config file.  we have a bridgeserver that uses a fairly
narrow range (10 ports to choose from).  let me know if you still have
problems today and you can test on our venueserver with our


On Wed, Jul 20, 2005 at 02:11PM, Michael Braitmaier said:
> This sounds to me like a firewall issue. The student has to open his
> incoming ports which are normally blocked in firewall configurations
> (outgoing-open, incoming-blocked). Thats the reason why you get his video.
> He is sending due to open outgoing traffic, but he doesn't receive your vic
> and rat streams due to blocked incoming ports.
> He has to open a port-range of 4 ports dependent on the unicast bridge's
> configuration.
> Regarding the already opened ports in combination with the IP, he possibly
> needs to open the ports not for your computer but for the computer the
> bridge is running on.
> Michael
> ----- Original Message ----- 
> From: "Darin Oman" <darin at ucar.edu>
> To: <ag-tech at mcs.anl.gov>
> Sent: Tuesday, July 19, 2005 10:05 PM
> Subject: [AG-TECH] Using a bridge
> >I'm trying to get a student at the USGS in Arizona AG-ready for a meeting
> >on Thursday. Unfortunately, there's no multicast capability there. So, I'm
> >planning to use NCSA's venue and multicast bridge. He had the firewall
> >opened there for IP, ports 30000-40000. Now, when he
> >connects to the bridge ("use unicast", I can see his video and his audio
> >pops up in RAT, but he's still not getting anything on his end. Is there
> >something I'm missing?
> >
> >Thanks,
> >Darin
> >

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