Hi Noel,
 
  Thank you very much for your reply.

  Yes, I agree. If "NAT Traversal" is not based on RTR, "Destination Port" 
is indeed a problem.


[email protected] (Noel Chiappa) 写于 2012-11-02 11:52:47:

>     > From: [email protected]
> 
>     > Consider the scenario that two ETRs behind a single NAT.
> 
>     > When NAT establish states for ETRs who both send packets outbound, 
it
>     > could assign different global IP addresses for them.
> 
> Most NAT devices (at least, IPv4 NAT devices) share a _single_ global IP
> address among multiple machines. So, the NAT _cannot_ "assign [a] 
different
> global IP address[] for" each ETR.
> 
>        Noel

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