Re: Can a customer take IP's with them?

[David A.Ulevitch <davidu () everydns net>]

On Jun 22, 2004, at 11:10 PM, Christopher J. Wolff wrote:

> David,
>
> Isn't renumbering an obligation?

I am not sure however RFC 2071 Touches on this subject in section 4.2.3 
but is ambiguous as to the nature of when the renumber should take 
place.

4.2.3   Change of Internet Service Provider

   As mentioned previously in Section 2, it is increasingly becoming
   current practice for organizations to have their IP addresses
   allocated by their upstream ISP.  Also, with the advent of Classless
   Inter Domain Routing (CIDR) [11], and the considerable growth in the
   size of the global Internet table, Internet Service Providers are
   becoming more and more reluctant to allow customers to continue using
   addresses which were allocated by the ISP, when the customer
   terminates service and moves to another ISP.
[SNIP]
            For obvious reasons, this practice is highly discouraged by
   ISP's with CIDR blocks, and some ISP's are making this a contractual
   issue, so that customers understand that addresses allocated by the
   ISP are non-portable.
[SNIP]
   It should also be noted that (contrary to opinions sometimes voiced)
   this form of renumbering is a technically necessary consequence of
   changing ISP's, rather than a commercial or political mandate.

In my opinion, which counts for nothing in this case, I would hope that 
12 months was enough time for the company to renumber.  Unless this 
decision to terminate services with NAC was 'just made' I think that 
space from ARIN 12 months ago was a heads up that their non-portable 
space should be eliminated from their network.

Just my $.02 with some RFCs tossed in,
davidu

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  David A. Ulevitch - Founder, EveryDNS.Net
  http://david.ulevitch.com -- http://everydns.net
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