On Aug 9, 2005, at 9:36 PM, Daniel Senie wrote:
Section 2.6: Please provide citations and statistics for the use
of NAT and RFC1918 in the delivery of ISP services. Though this is
talked about throughout this document, the practice is rare in at
least some regions. Hard data would lend credence to this claim.
Since this claim is used to justify many things in this document,
the lack of citations gives the appearance of a strawman construct.
While I don't have specific statistics, as this would require
access ot a lot of networks and the NDAs that accompany such, I do
know that the practice is common in Africa and parts of Asia. At
one time, China Unicom (which last year delivered over a billion
voice minutes using VoIP over an IP/ATM fiber backbone) used three
layers of NATs, citing inability to obtain IPv4 addresses as the
primary reason. They have since directly joined APNIC, I'm told,
and may no longer do that.