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RE: [RRG] What does incremental deployment mean
>From: Robin Whittle [mailto:email@example.com]
>Sent: Tuesday, April 01, 2008 4:37 PM
>Cc: Templin, Fred L; Xu Xiaohu; Dino Farinacci; Noel Chiappa
>Subject: Re: [RRG] What does incremental deployment mean
>Thanks - I should have remembered this:
>> ISATAP allows dual-stack nodes to discover routers that
>> can reach destinations on the global IPv6 Internet.
>> ISATAP is already widely implemented and deployed; in
>> many deployments it is even turned on by default.
>but it doesn't alter my understanding that it is not a solution to
>the IPv4 routing scaling problem, because the only way it helps is
>with hosts which are dual-stack and with applications which in fact
>communicate via IPv6.
The "domain of applicability" does not explicitly say
this, but dual-stack routers (or "hosts" that forward
packets on behalf of other nodes) are also within the
realm of application. That means that you can stack up
an arbitrarily large IPv6 network behind an ISATAP "host".
>Also, ISATAP is a transition mechanism, requiring an IPv4 address.
A private IPv4 address; yes. There are lots of those
available within end sites without impacting routing
scaling within the core.
>So its only contribution to the IPv4 routing and addressing problem
>would be to facilitate wide enough adoption of IPv6 that significant
>numbers of end-users would be happy to have IPv6-only addresses,
>with no IPv4 direct connectivity.
No; not IPv6-only. Use address selection rules to
determine the appropriate address for use under the
appropriate circumstances. Sometimes that means IPv6
and other times that means IPv4.
>That won't I happen, I think,
>until some very large proportion of hosts in general have IPv6
>connectivity - 90%? 99%? 99.9%?
> - Robin
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