Verizon Policy Statement on Net Neutrality

David Conrad drc at
Sun Mar 1 21:37:34 UTC 2015

> On Mar 1, 2015, at 4:26 PM, Owen DeLong <owen at> wrote:
>>> It was the combination of asymmetric, no or few IPs (and NAT), and
>>> bandwidth caps.
>> let's not rewrite history here: IPv4 address scarcity has been a thing
>> since the very early 1990s.  Otherwise why would cidr have been created?
> CIDR had nothing to do with address scarcity.


CIDR was created in response to the proliferation of "class Cs" being allocated instead of "class Bs". The reason class Cs were being allocated instead of class Bs was due to projections (I believe by Frank Solensky and/or Noel Chiappa) that showed we would exhaust the Class B pool by 1990 or somesuch.  This led to the ALE (Address Lifetime Extensions) and CIDRD working groups that pushed for the allocation of blocks of class Cs instead of Class Bs.

CIDR also allowed for more appropriately sized blocks to be allocated instead of one-size-fits-most of class Bs. This increased address utilization which likely extended the life of the IPv4 free pool.


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