NAT v6->v4 and v4->v6 (was Re: WG Action: Conclusion of IP Version 6 )

Per Heldal heldal at
Sun Sep 30 08:41:01 UTC 2007

On Sun, 2007-09-30 at 11:40 +0930, Mark Smith wrote:
> The model we're talking about seems to me to be that old model on
> it's head. The devices at the edge of the core network are fully aware
> of the underlying topology of the core network so they can make
> informed forwarding decisions. The tunnelling encapsulation only serves
> the purpose of transporting protocols/payloads, that aren't native in
> the core, from edge-to-edge. The tunnelling function doesn't try to
> control or have to take responsibility for the selecting paths taken
> across the core.

This is just is a slight move of the core/edge boundary. Core switching
capabilities (MPLS) have been added to edge devices which were pure
terminal-devices from an ATM-perspective. The MPLS-cloud is just as
obscure as ATM to a non-MPLS-speaking IP-device. 


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