To be more specific, at least section 5.5 ("it is unclear how implementers will
judge when the network conditions will have changed sufficiently to justify
turning off DNS Resolver Whitelisting and/or what the process and timing will
be for discontinuing this practice") is now incorrect. It *is* clear, and it's
what those implementers are doing as part of World IPv6 Launch.
Does that make more sense?
As the author, if it helps I plan to make the following change to Section 5.5
following the conclusion of IETF Last Call. I ran this by a few folks already
and it seems broadly acceptable (have not heard from Lorenzo yet though).
Jason
CURRENT 5.5:
5.5. Turning Off DNS Resolver Whitelisting
Domains that choose to implement DNS Resolver Whitelisting generally consider
it to be a temporary measure. It is unclear how implementers will judge when
the network conditions will have changed sufficiently to justify turning off
DNS Resolver Whitelisting and/or what the process and timing will be for
discontinuing this practice, though the extent of IPv6 deployment to end users
in networks, the state of IPv6-related impairment, and the maturity of IPv6
operations are all clearly factors. However, implementers may wish to take into
consideration that, as a practical matter, it will be impossible to get to a
point where there are no longer any IPv6-related impairments; some reasonably
small number of hosts will inevitably be left behind as end users elect not to
upgrade them or as some hosts are incapable of being upgraded.
PROPOSED 5.5 (NEW TEXT IN ALL CAPS):
5.5. Turning Off DNS Resolver Whitelisting
Domains that choose to implement DNS Resolver Whitelisting generally consider
it to be a temporary measure. It is unclear how implementers will judge when
the network conditions will have changed sufficiently to justify turning off
DNS Resolver Whitelisting and/or what the process and timing will be for
discontinuing this practice, though the extent of IPv6 deployment to end users
in networks, the state of IPv6-related impairment, and the maturity of IPv6
operations are all clearly factors. However, SOME IMPLEMENTERS HAVE ANNOUNCED
THAT THEY PLAN TO PERMANENTLY TURN OFF WHITELISTING BEGINNING ON WORLD IPV6 DAY
IN JUNE 2012 [REFERENCE]. IN ANY CASE, implementers may wish to take into
consideration that, as a practical matter, it will be impossible to get to a
point where there are no longer any IPv6-related impairments; some reasonably
small number of hosts will inevitably be left behind as end users elect not to
upgrade them or as some hosts are incapable of being upgraded.
<eom>
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