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Re: Follow-up work on NAT-PT
Softwires and usage of private IPv4 addresses, that was the reason we worked
on that !
I'm not yet convinced anything else is needed.
Regards,
Jordi
> De: Christian Huitema <huitema@windows.microsoft.com>
> Responder a: <owner-v6ops@ops.ietf.org>
> Fecha: Sat, 10 Nov 2007 08:12:27 -0800
> Para: Iljitsch van Beijnum <iljitsch@muada.com>, Brian E Carpenter
> <brian.e.carpenter@gmail.com>
> CC: David Miles <davidm@thetiger.com>, IPv6 Operations <v6ops@ops.ietf.org>
> Conversación: Follow-up work on NAT-PT
> Asunto: RE: Follow-up work on NAT-PT
>
> I don't think that we need to optimize for IPv6 only hosts. In practice, we
> can expect that IPv6 capable hosts will either be dual stack. Device designers
> will want to accommodate situations where their device connects to either an
> IPv6 network, or an IPv4 network. Implementing "dual stack" is not much harder
> than implementing "IPv6 only", so this is pretty much a no-brainer.
>
> We need to optimize for reliability and operation support. There, we have to
> reconcile the tension between two goals: networks are simpler and easier to
> operate if they support one protocol instead of two; and, networks are simpler
> if they do not rely on complex and error prone gateways.
>
> Is it really more efficient for an ISP to operate an IPv6 only network? If it
> is, then IPv4 services will have to be provided through some kind of overlay.
> On the provider side, the overlay will have connect to some IPv4 "gateways"
> that give access to the global IPv4 service. On the client side, the overlay
> will extend either all the way to the client itself, or terminate at the
> "access router".
>
> If we just want to reuse old technology, the overlay can be built with simple
> tunnels. Access routers routinely support protocols like PPPoA or PPPoE. PPP
> over IPv6 (PPPo6?) would not be much of a stretch. It would also not look to
> strange on the ISP side, since after all ISP are quite used to support PPP
> servers.
>
> If we don't like the hub and spoke nature of PPP, we can of course be creative
> and build the overlay with some form of automatic tunneling. But I am not sure
> that the automatic tunneling will actually reduce operation costs, or increase
> reliability.
>
> -- Christian Huitema
>
>
>
>
>
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