[AG-TECH] TCP to UDP bridges.....

Andrew A Rowley Andrew.Rowley at manchester.ac.uk
Fri Nov 3 03:26:35 CST 2006


In general, bridges use UDP as the AG traffic uses UDP.  The AG toolkit uses vic and rat, which only communicate using UDP.  I have a couple of solutions that help with this:

StaticBridge uses the same set of port numbers (4 for AG audio and video e.g. 2 per channel), regardless of the venue or the number of users.  This means that users need to open less UDP ports in general in their firewall.  This appears to work fine, although we have not had heavy usage yet, and we can't yet use this with the AG3 server due to differences in the way the Static and Quick bridges work (I have submitted updates but have no idea of the status of these, and if they will be in the next release).

I have also been working on a TCP-based bridge.  This appears to work OK just now, but I haven't really had any time to test it properly yet.  If you are interested, I could see about packaging something up for you to try out.  This also doesn't work with AG2/3 yet, although this will probably work in a completely different way to both the Static and Quick bridges again, and will probably require an AG Toolkit service to make it work (which I have again not had time to get going).

Andrew :)

Access Grid Support Centre,
RSS Group,
Manchester Computing,
Kilburn Building,
University of Manchester,
Oxford Road,
M13 9PL, 
Tel: +44(0)161-275 0685
Email: Andrew.Rowley at manchester.ac.uk 

> -----Original Message-----
> From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On
> Behalf Of Doug Baggett
> Sent: 02 November 2006 17:20
> To: ag-tech
> Subject: [AG-TECH] TCP to UDP bridges.....
> I may be behind on this....
> Is there any TCP capability in the AG3 bridges? I'm finding more and more
> users are getting UDP restricted due to security concerns.
> --
> No virus found in this outgoing message.
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> 31/10/2006

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