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Re: Backwards compatibility myth [Re: Last Call: <draft-weil-shared-transition-space-request-14.txt>]

Brian E Carpenter wrote:

> There were very specific reasons why this was not done. And it doesn't
> change the fact that an old-IP-only host cannot talk to a new-IP-only host
> without a translator. It is that fact that causes our difficulties today.

The fact is that an old-IP-only host can talk to a new-IP-only
host without a translator, if the new IP uses port numbers for

Though NAT is doing similar thing with translation, the
translation is not essential and can be reversed at end
systems using NAT information obtained through UPnP/PCP.

						Masataka Ohta
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