[arin-ppml] ARIN-prop-127: Shared Transition Space for IPv4 Address Extension

Aaron Hughes aaronh at bind.com
Thu Jan 20 11:56:52 EST 2011

While I hate the concept of NAT44, I completely understand there is no unique RFC1918 space not used in homes and therefore a new allocation must be available for transition. This should be used, IMHO, globally for NAT44 only. I support this proposal.


On Thu, Jan 20, 2011 at 10:36:50AM -0600, Jack Bates wrote:
> Oppose prop 127
> On 1/20/2011 10:26 AM, ARIN wrote:
> >Updates 4.10 of the NRPM:
> >A second contiguous /10 IPv4 block will be reserved to facilitate IPv4
> >address extension. This block will not be allocated or assigned to any
> >single organization, but is to be shared by Service Providers for
> >internal use for IPv4 address extension deployments until connected
> >networks fully support IPv6. Examples of such needs include: IPv4
> >addresses between home gateways and NAT444 translators.
> >
> For the use proposed, /10 is not enough space. It is also a use
> which is not region specific, and wasteful for each region to
> specify their own space for such purposes.
> >Until such customers replace their Home Gateways and all IPv4-only
> >devices with IPv6-capable devices, Service Providers will be required to
> >continue to offer IPv4 services through the use of an IPv4 address
> >sharing technology such as NAT444. A recent study showed that there is
> >no part of RFC1918 space which would not overlap with some IPv4
> >gateways, and therefore to prevent address conflicts, new address space
> >is needed.
> Overlap with home gateway addressing is not a concern of ARIN.
> RFC1918 could be utilized and home gateways reconfigured if
> necessary. It is wasteful to allow a small percentage of possible
> conflicts to warrant additional space. The larger conflict of
> RFC1918 space is cpe management addressing which used RFC1918, in
> which case, a very large cable company just ran out and had to
> request addressing to support this case. A /10 wouldn't come close
> to supporting that many subscribers.
> Jack
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Aaron Hughes 
aaronh at bind.com
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