Re: [GnomeMeeting-list] Video loss when connecting via 2 Linksys routers

[Damien Sandras <dsandras seconix com>]

Le mar 29/04/2003 à 13:25, Kenneth R. van Wyk a écrit :

> That makes sense.  Is it feasible to have GnomeMeeting also attempt to 
> wait/recover?
> 

I guess so, but it is far to be easy to implement.

> 
> Both sides are using port forwarding and IP translation (via NAT).  But, as I 
> indicated, the sessions initiate successfully and consistently.  It's only 
> after a few minutes that the video gets dropped.  While that may well be 
> something due to the router, it's not as simple as opening up a particular 
> port.  (We both allow UDP/1024-65535, along with TCP/1720 and such during 
> video connections.  And, MS-Netmeeting functions just fine with the same 
> ports open -- but I'd MUCH rather use GnomeMeeting on my primary Debian 
> desktop system for the connections.)
> 

There is something I don't understand here. Are you really forwarding
TCP 30000 to 30010 + 1720 and UDP 5000 to 5003 to the internal machine
or just "allowing" them?

If Netmeeting works with the same configuration, then it indicates that
your router natively supports H.323 and in that case you can *not* use
port forwarding and IP Translation... Port forwarding and IP Translation
are only needed when the NAT implementation is not able to natively do
H.323 as explained in the FAQ...

If your router natively supports H.323, you need to disable IP
translation, disable H245 Tunneling and Fast Start, and only forward
1720 (for incoming calls). You do not even need to open any ports except
1720.


> Thanks again for all of your assistance on this.  I hope that we can find the 
> problem and fix it so that others can appreciate the added stability in 
> GnomeMeeting.  It is a fabulous tool, by the way.  Kudos for doing a superb 
> job!
> 
> Cheers,
> 
> Ken van Wyk
> 
> >
> > Le lun 28/04/2003 à 23:11, Kenneth R. van Wyk a écrit :
> > > Damien,
> > >
> > > On Monday 28 April 2003 15:56, Damien Sandras wrote:
> > > > I suggest you to run GM with --debug=3 and see what happens really.
> > > > No the problem is not normal...
> > >
> > > Thanks.  I've done that and have appended my debug output (excerpt)
> > > below.  I also have another data point.  I just tested the same
> > > connection, but this time I ran ohphone at my end, with gnomemeeting
> > > still at the other end.  The gnomemeeting end dropped video once again,
> > > within moments.  The ohphone end continued on for about 15 minutes and
> > > then it too went blank.
> > >
> > > In the gnomemeeting log below, the telltale (to me) line is the RTP_UDP
> > > Data Read error (11): Resource temporarily unavailable line.
> > >
> > > Any ideas what the problem could be?  Could we have stumbled onto a
> > > somewhat obscure bug?
> > >
> > > Thanks for your help.
> > >
> > > Cheers,
> > >
> > > Ken van Wyk
> > >
> > >   2:11.807            LogChanTx:83277e0 H261    Read frame from the video
> > > source.
> > >   2:11.810            LogChanTx:83277e0 H261    Success. Read frame from
> > > the video source in 2 ms.
> > >   2:11.839           RTP Jitter:837bb58 RTP     Receive statistics:
> > > packets=8111 octets=324440 lost=1533 tooLate
> > > =2948 order=1 avgTime=6 maxTime=13 minTime=0 jitter=1 maxJitter=6
> > >   2:11.932            LogChanTx:83b2768 H323RTP Transmitter sent
> > > timestamp 549440
> > >   2:12.036            LogChanTx:83277e0 H261    Read frame from the video
> > > source.
> > >   2:12.040            LogChanTx:83277e0 H261    Success. Read frame from
> > > the video source in 3 ms.
> > >   2:12.068            LogChanRx:83b4100 RTP_UDP Data read error (11):
> > > Resource temporarily unavailable
> > >   2:12.069            LogChanRx:83b4100 H323RTP Receive H.261 thread
> > > ended 2:12.166                 gnomemeeting RTP     Found existing
> > > session 1 2:12.167                 gnomemeeting RTP     Found existing
> > > session 2 2:12.276            LogChanTx:83277e0 H261    Read frame from
> > > the video source.
> > >   2:12.280            LogChanTx:83277e0 H261    Success. Read frame from
> > > the video source in 3 ms.
> > >   2:12.296           RTP Jitter:837bb58 RTP     Dropped 2 packet(s) at
> > > 50474, ssrc=4282363546
> > >
> > > _______________________________________________
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> > > GnomeMeeting-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/gnomemeeting-list
> 
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-- 
 _	Damien Sandras
(o-	GnomeMeeting: http://www.gnomemeeting.org/
//\	FOSDEM 2003:  http://www.fosdem.org
v_/_	H.323 phone:  callto://ils.seconix.com/dsandras seconix com
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