Re: [GnomeMeeting-list] Help troubleshooting Gnomemeeting

[Damien Sandras <dsandras seconix com>]

le ven 11-01-2002 à 15:27, Damien Sandras a écrit :
> check with netstat -a
> 
> I think that you have to open 5000-5001-5002-5003
> 

No, I'm wrong, sorry. I must be tired. 
You need to open UDP ports from 5000 to 5001.

If you make a video + audio call, with H.245 Tunneling, and that
somebody is calling you, you will get :
- an incoming connection on port 1720 (TCP) : that port needs to be
allowed for incoming connections
- an incoming connection for RTP audio on a random UDP port (starting
from 5000)
- an incoming connection for RTP video on a random UDP port (starting
from 5000)

There will also be 2 other UDP ports opened for audio and video (2 for
audio+video transmission, and 2 for audio+video reception).
Your client will open 2 UDP ports so that the remote is able to
establish 2 incoming UDP connections. And the remote will do the same.
It implies 4 UDP ports on your machine, but on a firewall perspective,
you only need to permit 2 of them for incoming connections (the other 2
are from you to the remote).

However, if you are behind NAT, 4 UDP (2 incoming + 2 outgoing) ports
and 1 TCP will go through your NAT machine.

I can't make it more clear :)

> Im not sure though, I would check.
> 
> le ven 11-01-2002 à 15:11, Erik Reuter a écrit :
> > On Fri, Jan 11, 2002 at 02:20:36PM +0100, Damien Sandras wrote:
> > 
> > > Probably not, but the problem is not from you to the other end, but
> > > from the other end to you. It means that you would have to communicate
> > > with somebody who is using a port below 2000, for example.
> > 
> > Can anyone suggest a good way to test which ports are blocked on my
> > machine? I'm not much of a programmer, nor am I an expert on routers and
> > TCP. Any help is appreciated.
> > 
> > For a specific example, how can I check if packets bound to my computer
> > on port 5000 are getting through? I used nmap to portscan all ports from
> > 1-6000, but the highest port it detected open was 1720 (GM was running
> > at the time). I think that no program was listening on port 5000 at the
> > time. How can I tell the difference between no program listening on a
> > port, and the port being blocked?
> > 
> > 
> > 
> > -- 
> > "Erik Reuter" <ereuter erikreuter net>       http://www.erikreuter.com/
> > _______________________________________________
> > Gnomemeeting-list mailing list
> > Gnomemeeting-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gnomemeeting-list
> > 
> -- 
>  _	Damien Sandras
> (o-	GnomeMeeting - H.323 Video-Conferencing application -
> //\		web:  http://www.gnomemeeting.org/
> v_/_	FOSDEM 2002  - Free Software and Open Source Developers Meeting -
> 		web:  http://www.fosdem.org/
> 
> _______________________________________________
> Gnomemeeting-list mailing list
> Gnomemeeting-list gnome org
> http://mail.gnome.org/mailman/listinfo/gnomemeeting-list
> 
-- 
 _	Damien Sandras
(o-	GnomeMeeting - H.323 Video-Conferencing application -
//\		web:  http://www.gnomemeeting.org/
v_/_	FOSDEM 2002  - Free Software and Open Source Developers Meeting -
		web:  http://www.fosdem.org/