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
addressing/routing.
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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