[james woodyatt]
The purpose of ULA-C/G, as near as I can tell, is to mitigate the
risk of
an already vanishingly low probability collision-- ...
[Paul Vixie]
nope.
[james woodyatt]
Hmmm. I guess the alternative is that the purpose of ULA-C/G is to
mitigate the risk of collision when merging on the order of hundreds
of thousands of ULA networks in one routing realm... sort of like
creating a "local DFZ" of a sort.
Forgive me, but that sounds even more surreal. It's tough for me to
imagine how a real organization doing that could fail to qualify for a
PI allocation, or why such an organization would find it unacceptable
to have to use a PI allocation without advertising it to the public
DFZ. Likewise, it's tough to imagine how an organization that doesn't
qualify for a PI allocation could be merging enough ULA networks
together that the risk of collision rises to a level of any real
significance.
Perhaps you haven't read or understood what I've written previously.
The purpose of ULA-G is to allow RIRs to allocate private address space
in a non-discriminatory manner to organizations who wish to use it
outside of the DFZ.
As stated previously, the rules for getting PI space are based on the
expectation that PI blocks can be announced into the DFZ. The proposed
rules for ULA-G space are based on the expectation that ULA-G blocks
will not be announced into the DFZ, and that they will be allocated out
of a single global netblock, identified in an RFC, that everyone knows
can and should be filtered. As stated quite clearly by Joe Abley in the
"Why ULA-* will not harm the DFZ" thread, that difference in
expectation, and ease in filtering when desired or necessary, makes it
possible to give out ULA-G space in a non-discriminatory manner (which
is simply not prudent for PI space today).
-Scott
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