[Ietf-not43] I-D ACTION:draft-ietf-crisp-internet-resource-number-req-00.txt

[Shane Kerr]

Andrew Newton wrote:
> Tim Christensen wrote:
> 
>>
>> Which is not to say that it's not desirable to be able to uniquely
>> identify a network block (and indeed, when two networks match, which one
>> is the supernet and which one is the subnet).
> 
> 
> How do you get two network blocks with the same starting and ending 
> addresses?  And how do they have a relationship other than equivalence? 
>  Or is there a temporal relationship?

Say I have received a /17 and a /19 from ARIN, disjoint.  One of my 
customers is now big enough that they can use an entire /19.  I want to 
assign the entire block to them.  Therefore I create an entry in the 
database reflecting this.  We still have:

IANA -> ARIN -> ISP -> User

And want to reflect this relationship, but the block to the ISP and the 
User are the sam, in terms of start/end address.

-- 
Shane Kerr
RIPE NCC