[arin-ppml] Use of "reserved" address space.

Roger Marquis marquis at roble.com
Tue Jun 29 18:30:24 EDT 2010

Ted Mittelstaedt wrote:
> On 6/26/2010 9:54 PM, James Hess wrote:
>> As far as I can tell , the internet is not on course for a
>> well-implemented transition to IPv6. It is on a collision course with IP
>> exhaustion, and the fallout of the crash is NAT hell.

NAT hell for some, but not those of of us with NAT experience and
security responsibilities.  We would be happy to deploy more NAT,
including LSN, if it means a smooth transition to IPv6, especially if it
also means some responsible organization will someday take responsibility
for A) the inevitable process of reclaiming unused legacy allocations,
and B) denying new allocations to entities who can use NAT/LSN but are
not.  Doesn't look like ARIN or the IETF is capable of being that
organization though.

> A lot of orgs will NOT even look at IPv6 until that crash happens.

Havent seen much of that to be honest.  Most of those who have tried
dual-stack end-nodes have found it unworkable.  End-user organizations
are looking for a transition to IPv6 and are (IME) more than willing to
use IPv6 externally, but the gear is not available and there is no
business case for making internal address space globally unique or
re-numberable (where multi-homed).

> That's just human nature.

That's another of those unsupportable claims that cannot be explained
except perhaps by financial interest (in speculative address shortages).
It is not unlike claims that * multi-homed sites can get by with internal
renumbering, * NAT is "too hard", * LSN is not transparent enough, * NAT
has no security benefit, * netops won't mind if three-way handshakes can
be initiated from external networks, * NAT breaks properly designed
protocols, * properly designed firewalls can replace NAT, ...

Because of these speculative interests the cost of IPv6 is too high to
warrant investment in IPv6 today.  When transitional technology (NAT)
that meets end-user requirements is made ubiquitous we will see IPv6
uptake in earnest.

Roger Marquis

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