Hi All,
I am currently going through the NAT Scenarios. I have a doubt regarding a
NAT Scenario and would want to know what would be the solution for the same.
The scenario is as follows :-
UA1 ---> Symmetric NAT ---> Proxy/Registrar ----> UA2
The UA1 is in private domain. The Proxy/Registrar and UA2 are in public domain.
There are two transports through which the UA1 can register with Proxy i.e. TCP
and UDP.
> If the UA1 registers with its private ip address and port which is a TCP
> contact then the UA1 establishes a connection with the Proxy/Registrar using
> the instance-id and flow-id. Now if the UA2 wants to contact UA1 then using
> the instance-id and flow-id, the already opened connection is obtained and
> the request is forwarded to UA1.
> If the UA1 registers with its private ip address and port which is a UDP
> contact. In this case there would be no connection establishment between UA1
> and Proxy/Registrar. Now if UA2 wants to contact UA1 using the private IP
> address of UA1 then how does the UA2 request traverse through SYMMETRIC NAT,
> as the UA1 contact is not reachable from the Proxy/Registrar ??
Thanx,
Jose
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