[arin-ppml] Fantasyland

michael.dillon at bt.com michael.dillon at bt.com
Thu Aug 28 06:09:32 EDT 2008

> OTOH, there are several large companies that have legacy As, 
> which currently have no incentive to return them to ARIN.  
> Many could renumber into a /16 or less, using NAT, if only 
> they had the financial motivation to incur that cost; ditto 
> for the hundreds of companies sitting on multiple Bs that 
> could renumber into a /24 if motivated. 

How many dollars would it take to convince a single company 
to renumber from a /16 into a /24? Actual dollars please.

> However, that still 
> only buys us another year or two at current growth rates...

Too true. Now consider the cost that this same company will
incur to renumber into IPv6 two years after renumbering into
a /24 using NAT. Can you justify this extra cost?

Why shouldn't the company in question just deploy IPv6 and
install NAT-PT gateways to cover the next 2-3 years before
IPv6 transit is widely available?

--Michael Dillon

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