On Jun 27, 2007, at 04:09, Brian E Carpenter wrote:
On 2007-06-27 00:42, Roger Jorgensen wrote:
On Thu, 21 Jun 2007, james woodyatt wrote:
<snip>
We successfully deprecated site-local unicast addressing by
painting it with the stink of IPv4 network address translation.
However, we retained the technical consensus that unreachable
nodes still need to be uniquely addressable, and what's more:
these unreachable global scope unicast addresses must be assigned
from a registry with a single global root.
My heretical opinion is that the second technical consensus is
wrong. We should deprecate the 'L' bit in the ULA address type
and make all ULA into locally allocated addresses. That way, we
will have carved off a well-known prefix (like all the other non-
routable prefixes) where nodes are neither uniquely addressable
nor reachable on the public Internet. I contend the 'L' bit was
never a good idea; it was a placeholder for those wishing to
retain network address translation in IPv6. There, I said it.
I believe that is a misunderstanding of the L bit in RFC 4193. All
it means is: this address was allocated using the procedure defined
in RFC 4193. In every other respect it is a no-op and there is no
difference between ULAs defined with L=1 and L=0.
I don't think I've ever been confused about that.
agree... let's go back to the original RFC defining ULA and remove
that bit and using this entire thread over the last few months as
a reason why it never should be global unique etc....
Oh, let's undeprecate site local at the same time then and recreate
the mess in its entirety. (I don't think so.)
Please, in the name of all that is hallowed, please, let's leave site-
local in the oubliette where it belongs.
I merely contend-- albeit heretically-- that "L=0" in RFC 4193 is
nonsense. We should hand fc00::/8 back to IANA and revise RFC 4193
so that fd00::/8 is the ULA prefix identifier, where all addresses
are allocated according to to the procedure currently defined, have
global scope, are not routed in the DFZ and receive synthetic reverse
delegations in 0.0.d.f.ip6.arpa to an anycast address reserved by IANA.
--
james woodyatt <[EMAIL PROTECTED]>
member of technical staff, communications engineering
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