RE: requirements draft revision

["Tony Hain" <alh-ietf@tndh.net>]

Joe Abley wrote:
> An "enterprise" is an entity autonomously operating a
> network using TCP/IP and, in particular, determining the
> addressing plan and address assignments within that network.
>
> Consider:
>
>
>   A --- B --- C
>         |     |
>         D     E
>
> A, B, C, D are all enterprises. B, E are transit providers of C.
> A, D are transit providers of B. Both C and B are multi-homed.
>
> If C has customers, then C is a transit provider for
> those customers.

Is C a transit provider if the customer is receiving a /27, but simply
defaulting to C's routing policies? What is the difference between that and
using a dial-in NAT to map 10/8 through a single address received from C?
They both fit the definition of Enterprise here. In both cases the address
space and routing policies presented to B & E belong to C, so what makes C a
'transit' provider?