On Sep 25, 2011, at 9:42 AM, John C Klensin wrote:
Remembering that an ISP who wants to avoid the use of public
IPv4 addresses on its backbone/infrastructure has the option of
simply converting that infrastructure to IPv6, tunneling
public-address IPv4 packets (both its own and those of its
customers) over that IPv6 infrastructure using a tunneling
approach of its choice. Longer-term, that approach makes the ISP
far more IPv6-ready, while "more private/shared IPv4 space" is
just another dead end.
Yes, but even if it does this (and I agree that it's a strategy well worth
considering) that ISP is going to need IPv4 addresses to assign to its
customers until the customers migrate to IPv6.
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