[AG-TECH] Loopback Multicast and linux

John Hodrien johnh at comp.leeds.ac.uk
Thu Oct 27 13:17:46 CDT 2005

On Thu, 27 Oct 2005, Piers O'Hanlon wrote:

> Hi John,
>> Relating this particularly to using VP, although it does apply to vic as
>> well.  Under linux vic doesn't loopback the multicast to the localhost, so
>> in the VP window I can't see my own video.  I've done a simple 3 line hack
>> to vic to make this work, but was wondering if anyone else had comments on
>> what the default behaviour should be.
>> Do people reckon this should be a commandline option to vic?
> There are some many different things that one might want to control - it's 
> debatable if we want it a command line option.

Absolutely, I just thought I'd see if people had better ideas, which they seem
to ;)

> You can tell vic to loopback its packets by creating a file in your home dir 
> called ".vic.tcl" and putting the following into it:
> #!/bin/sh
> #\
> exec wish4.2 "$0" "$@"
> #
> proc user_hook {} {
> global V
> #
> # allows reception loopback of packets
> $V(session) loopback 1
> #
> # allows loopback of packets
> $V(data-net) loopback 1
> $V(ctrl-net) loopback 1
> }
> When you next start vic it will send packets out of the loopback interface 
> (and display two local video windows - u can get rid of the second video 
> window by commenting the "$V(session) loopback 1" line.



"For every complex problem there is an answer that is clear, simple, and
wrong."                                              -- H. L. Mencken

More information about the ag-tech mailing list