Re: [GnomeMeeting-list] Another Gnomemeeting-Netmeeting problem -> Firewall problem!

[Dean Tsou <dttsou iinet net au>]

Thanks for the reply Damien... yes, I did read that section in the FAQ, 
but what confuses me is the fact that I only have tcp ports 30000-30010 
open on the firewall, and no udp ports ("UDP ports between 5000 and 5003 
for audio and video" as indicated on the FAQ), yet I can transmit video 
to the outside world?? Now how does that work??

Cheers,
Dean


Damien Sandras wrote:

> Hi,
>
> your problem is not a GnomeMeeting/netmeeting problem, but a firewall
> problem! ;)
>
> Le mer 30/10/2002 à 04:13, Dean Tsou a écrit :
>  
>
> > Hi All,
> >
> > I've been trying to get my Gnomemeeting to work behind the firewalled 
> > gateway on my home network for ages! It is finally SORT OF working using 
> > the gnugk (openh323gk) . I am trying to call someone outside my home 
> > network who is using NetMeeting without a firewall/NAT. The result is 
> > that they can see me, but I can't see them (I have made sure that they 
> > are transmitting video).  I believe my problem lies in the port 
> > configurations on my gatekeeper and firewall. I have tcp ports 
> > 30000-30010 open as well as 1720-1721 open... I don't have any udp ports 
> > open for it. Could that be the problem?
> >    
>
> Yes, you need UDP ports opened. But the ports you are allowing
> (30000-30010) are the ports used by GnomeMeeting. Nothing assures you
> that the gatekeeper is using the same ports. You have to allow the ports
> used by the gatekeeper if the gatekeeper is on the firewall, not the
> ports used by GnomeMeeting.
>
> Now, I wonder why you are not simply using GnomeMeeting 0.94.1 and IP
> Translation. It works out of the box for many users. Only forwarding TCP
> 30000-30010 1720 and UDP 5000-5003 to your internal host and it works.
>
>  
>
> > BTW, can someone explain to me what the use of tcp ports 30000-30010 and 
> > udp ports 5000-5003 are used for?? I am not clear on the H323 protocol 
> > and have done lots of searching on the web without much success. Have 
> > also read the FAQ but still don't know what ports are used for what. Any 
> > help would be appreciated.
> >    
>
> In the FAQ:
> Question http://www.gnomemeeting.org/index.php?rub=3&pos=0#AEN196:
>
> 6.1. What ports does GnomeMeeting use for H.323?
>
> * 1720 TCP for the H.225 channel.
>
> * TCP ports between 30000 and 30010 for the H.245 channel. If both H.323
> software are using H.245 Tunneling, those ports won't be used. However,
> Netmeeting doesn't support H.245 Tunneling and those ports will always
> be used when being in a communication with a Netmeeting user. Notice
> that Netmeeting doesn't use the same ports on his side than
> GnomeMeeting, but is using random ports instead.
>
> * UDP ports between 5000 and 5003 for audio and video.
>
> I guess you didn't read the right question in the FAQ... :)
>  
>
> > Cheers,
> > Dean
> >
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