[AG-TECH] TTL - Multicast

Robert Olson olson at mcs.anl.gov
Thu Mar 14 15:05:18 CST 2002

an alternative that might work is

         vic -Xmaxbw=<value> ...


At 02:35 PM 3/14/2002 -0500, Nolan, Kevin [NCSUS] wrote:

>Actually, our problem is with the vic in windows.  We are using windows 
>2000 machines as capture computers.  In linux the -B option works fine.
>According to the vic-userguide...
>         Set the maximum value of the bandwidth slider to a user-specified 
> number of kbit/s.  This value is limited to 256 kbit/s if the conference 
> address is a multicast address and the TTL in use is greater than 64 (ie, 
> the traffic will leave your multicast region).
>So in the windows vic the above is true, but in the linux vic this must 
>have changed in the code.  It doesn't matter what we set the bandwidth to 
>in windows...if the TTL is 127, it behaves as the guide suggests above.
>We'd like to be able to have a TTL of 127 and a bandwidth value of much 
>more than 256 kbit/s on our windows capture machines.
>-----Original Message-----
>From: Robert Olson [<mailto:olson at mcs.anl.gov>mailto:olson at mcs.anl.gov]
>Sent: Thursday, March 14, 2002 1:45 PM
>To: Nolan, Kevin [NCSUS]; 'ag-tech at mcs.anl.gov'
>Subject: Re: [AG-TECH] TTL - Multicast
>At 12:01 PM 3/14/2002 -0500, Nolan, Kevin [NCSUS] wrote:
> >The problem we're seeing with both VIC and Rat is that as the TTL value
> >gets increased, the amount of data being transmitted is decreased as a way
> >to alleviate network congestion.  The problem with this is that our remote
> >sites generally connect via high-bandwidth links, and the associated lower
> >frame rates are unacceptable for real-time communication between
> >sites.  Is there any way that we can change these values, or does the
> >source code have to be modified?
>the AG software passes a max-bandwidth option to vic that overrides the
>          vic -t 127 -B 10000 ip/port
>What is rat doing with ttl? is it refusing to let you set the higher-rate
>encodings? I don't think I have any particular settings to make rat work
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