One point about gateway-initiated 6rd is that the gateway IPv4 address
can be truncated, depending on the length of mask used for the network
device address space. That gives more bits for the routing part of This
should be a considerable improvement on the compression available using
straight 6rd, and gives a better chance of a 'sensibly' sized IPv6 prefix.


On 08/11/2010 6:53 PM, Ole Troan wrote:
...

2) my concern with using 6rd for this purpose is that while automatic
tunneling by encoding the tunnel end point in the payload address is
convenient. offering a 'sensible' sized IPv6 prefix to end users is
going to be problematic. note this is purely a concern from a
deployment perspective. I have no doubt that you can _use_ 6rd this
way. just because we _can_, _should_ we? can you give some examples
of how you deliver e.g. /56 or /64 to end users, using gi-6rd?
(without expecting the SP to have a /16 of v6 space obviously).

cheers, Ole

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