Hello,

At 06/03/2002 09:34 +0100, Jozsef Kadlecsik wrote:
>It is a bug of the module due to its primitive way of "handling" H.323.

Let's imagine this setup :

PC1 ---  NAT router 1 ---- NAT router 2 ---- PC2

with PC1 : 192.168.0.9
NAT 1 : 192.168.0.1 and 80.13.55.223 (for example)
NAT 2 : 192.168.0.1 and  (for example)
and PC2  : 192.168.0.25

I think i found the reason why it doesn't work if PC1 and PC2 had the same 
addresses.

When PC1 try to call PC2, h323 modules are modifying h225 packets and 
change each 192.168.0.2 sequence in 217.117.0.1 ; and it records 
information to track future packets. Am i right ?

The problem is, the modules do not modify h245 packets in the right way, it 
does not modify the first IP address that appears, but only the last one.

After that thing, netmeeting on PC1 try to contact 192.168.0.25. By chance, 
there is no 192.168.0.25 on this network. I am not sure that audio is going 
well, because i don't have no microphone for this test.
But if you give PC1 ip 192.168.0.25, it crashes the connection setup 
(because PC1 tries to contact himself, and it's bad).

I attach the incriminated packet sniffed on PC1, if somebody want to give 
me his opinion.

Jozsef, is there a good reason for changing ip - like 4 bytes sequence only 
one in the packet ?

Regards,

-- 
Clément Moreau
Inventel Systèmes -- www.inventel.com
PARIS

Meet Inventel at those shows / Nos prochains rendez-vous :
- CeBIT 2002 March 13-20 : Hall 27 / Booth F23 & Hall 13 Bluetooth
pavilion
- Bluetooth Congress Amsterdam 2002 June 11-14 / Booth 401

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