[AG-TECH]Fun with Venue Servers and NATS

[Michael Miller]

John,
A difference would only be seen if you had a bad 
connection to the bridge, or the bridge had 
problems with the multicast address.  Dynamic vs. 
static shouldn't make a difference.

myk

At 01:20 PM 3/12/2007, you wrote:
>Thank you MYK!
>
>I will test this at at that site tomorrow.  If anyone is available after 1pm
>EDT, in the NCSA Lobby I will try to test for at least four hours...most
>likely using chat for communication:)  This is actually a cool problem.  Not
>for production:( but as a puzzle:)
>
>Anyone: (Opinion) Does it matter if I am testing this NATed site in the NCSA
>Lobby or in a "room"...as one is dynamically multicasted and the rooms are
>statically mulitcast addressed?  Would the nature of a NATed site more prone
>to showing video in either case than the other? ...okay I know I am drawing
>straws now:)
>
>Thanks all,
>
>John
>
>
>Michael Miller <mimiller at ncsa.uiuc.edu> said:
>
> > John,
> >
> > If you look at the NATted site's Producer vic, do
> > you see their video there?  You will need to
> > unmute it.  What you describe occurs because only
> > on app can receive data from a port at a
> > time.  Since you have a single connection with
> > the bridge, in order to get past the NAT, the
> > first vic launched(in this case the producer)
> > steals the data from the second vic.  Often you
> > may see "waiting for video" in the consumer
> > vic.  This only occurs in single machine nodes or
> > any node that runs the producer and consumer vics on the same machine.
> >
> > The solution is to look for the missing video
> > streams in the Producer vic, unmute them and open them from there.
> >
> > Let me know if you have questions.
> >
> > myk
> >
> > At 10:03 AM 3/12/2007, john langkals wrote:
> > >Hello AG Tech,
> > >
> > >There have been a few emails discussing NATS and
> > >Access Grid connectivity on the list lately.  I
> > >am trying to setup and Access Grid at another
> > >site.  Trying to go through their NAT on my end
> > >is no problem. I see all external and local site
> > >video just fine.   The only issue is the NATted
> > >site will get most external video streams that
> > >are connected but they do not see their local
> > >video.  Also as they restart their video, more
> > >remote site video streams appear.  Just no local
> > >video. This is no surprise as NATed routers do
> > >not have true end to end connectivity and it may
> > >break some IP protocols such as UDP. I am
> > >testing in the NCSA Lobby (venue server) and as
> > >this site does not support off site multicast,
> > >they are bridging unicast.  I have tested this in AG 2.4/3.0.2.
> > >
> > >My question is
if I would setup my own venue
> > >server, would I be able to pull off any tricks
> > >for both sides to transmit and received video
> > >just between our two sites? Hoping only just
> > >connecting between two sites would help out some
> > >how
 Is there any way to build a stripped down
> > >venue server that would pull off any port
> > >forwarding tricks?  I remember there was a
> > >project called AG Connector but I can’t find any
> > >information about it.  To anyone’s knowledge, would this be useful in my
>quest?
> > >
> > >Thanks,
> > >
> > >John
> > >
> > >John Langkals
> > >Systems Manager
> > >Ohio Center for Technology and Science
> > >M2021 Physics Research Building
> > >191 West Woodruff Avenue
> > >Columbus, Ohio 43210
> > >614.292.6957 Office
> > >614.327.3732 Cell
> > >614.292.7557 FAX
> > >www.octs.osu.edu
> > >
> >
>
>
>
>--