Re: RES: RES: ReN: IPv6 tranisition issues

On Mon, 6 Jan 2003 16:01:34 -0200
"Marcelo Barbosa Lima" <[email protected]> wrote:

> 
>  Hi Keith,
> 
>    I dont know one application what NAT (or reverse NAT) are not abble > to support or what one NAT implementation can be extended to provide > support it. If NAT implemantation is smart and application sense, I > think that I can do translation of IP addresses and ports in > application data (without cryptography), if necessary, like I do in > FTP and other tricky protocols. 

you are completely mistaken.  the NAT does not have sufficient information to perform the conversion even if it is aware of the protocol that the application is using.

> Can you tell me applications where NAT can not be used? Regards,

almost any distributed application fails in the presence of NAT unless there is a central server via which communications are routed.  the ones I'm most familiar with are used in distributed computation: netsolve, globus, pvm.  but SIP has this problem also.

Keith