John;

> > You can have IP over HTTP, IP over XML or IP over WAP equally easily.
> >
> > The problem, however, is that the reconstruction point is an
> > intelligent gateway which violates the end to end principle.
> 
> Mmm, how so? I'd see it as a router, which just happens to run over a
> higher-level protocol than most.

No, it is no router of the Internet. For example, your protocol does not
interact with the routing metric of the Internet.

> Not a great design, but it does (can)
> give you end-to-end IP.

Like NAT, it works most of the time, unless you try things
unsupported by the so intelligent gateway.

Of course, you can insist NAT offer end-to-end IP.

                                                Masataka Ohta

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