Re: [GnomeMeeting-list] Re: Nat traversal

[Allan <amau sympatico ca>]

On Sunday 22 January 2006 14:18, Damien Sandras wrote:

> With symmetric NAT, you will get random results, sorry. Try to turn that
> symmetric NAT into Cone NAT by correct port forwarding.
>
You keep saying that but as far as I know, I have forwarded all of the reports 
mentioned in the documentation.  Here is what my modem reports on port 
forwarding:

<quote>
Name			   Protocol	Port	              Redirected to IP Address	

Custom Configuration	TCP 	5235 - 5236	    192.168. 2. 10	*
Custom Configuration	UDP	5237	             192.168. 2. 10		
Custom Configuration	UDP	5000 - 5100	     192.168. 2. 10		
Custom Configuration	TCP  	5060	              192.168. 2. 10		
Custom Configuration	TCP	  30000 - 30010	     192.168. 2. 10		
Custom Configuration	UDP	8000 - 8005	     192.168. 2. 10		
MSN Netmeeting
Microsoft Messenger Service
CU-SeeMe H323
AOL Instant Messenger TCP	1720	              192.168. 2. 10		
Custom Configuration	UDP	16384 - 16391	192.168. 2. 10	
	
<endquote>.  * address of my internal machine

Here is what Ekiga.org has to say about port forwarding:

For SIP:
<quote>
If it reports "Symmetric NAT" and that you are not using GNU/Linux, then you 
are not part of the 99% of lucky users. You will have to forward UDP ports 
5000 to 5100 to your internal machine. Run the test again, it should report 
"Cone NAT" or "Port Restricted NAT". 
<endquote>

For H323:
<quote>
   3. If it reports "Symmetric NAT" and that you are not using GNU/Linux, then 
you will have to forward ports 5000 to 5100 to your internal machine, as well 
as other port ranges described in 1) under the same conditions.  &&&&&&
      You many need to forward a few ports following the cases, please refer 
to 4) to know which ports and determine if you need to forward them or not in 
your case.
   4. If you want to be reachable from the outside, you will need to forward 
TCP port 1720 from your router to the internal machine running Ekiga.
      If you want to be able to do calls with Netmeeting users, you will need 
to forward TCP ports 30000 to 30010 from the NAT router to the machine 
running Ekiga.
      This last step is only necessary when calling H.323 software that does 
not support H.245 Tunnelling (the H.323 part of Ekiga supports H.245 
Tunnelling, forwarding that TCP port range is thus not required when calling 
them using H.323). 
<endquote>

&&&& What is 1) above.  Is the documentation missing something?  I can find no 
further references to the ports needing to be forwarded than the ones listed 
in the two quotations above.

To confirm my understanding, I next went the GM site and consulted the FAQ 
once more.  I can find no references to ports other than the ones listed in 
the two quotes and in the listing from my modem.

So what gives?  Are there other ports which need to be opened which are not 
listed in the documentation?

Finally, if I have not forwarded ports correctly, how is it possible that FWD 
is able to call me?

Allan