Re: ISP operational question

["Todd Caine" <todd_caine () eli net>]

The assumption that your initial allocation of address space is going to be a /20 is
probably incorrect.  Allocation of address space is based on a slow start procedure
outlined in RFC2050.  What usually happens is that you request enough address space to be
at 50% immediate utilization and 80% utilization within 3 months.  To receive a
contiguous /20 will probably require multiple IP requests and plenty of renumbering.  =P

t


Charles Smith wrote:

> Please consider the following scenario:
>
> A new company wants to become a regional ISP. This company will purchase one
> or two large bandwidth circuits from a NSP of their choice.
>
> Then the new regional ISP will offer private line p2p Internet service to
> regional businesses. Basically, this is a small operation.
>
> Now here is the question. What choices does the regional ISP have when
> implementing routing and IP addressing? I assume the regional ISP will not
> implement BGP, since there will only be one maybe two upstream connections
> to a single NSP - initially.
>
> Furthermore, I assume the NSP would provide the regional ISP with a supernet
> - say a /20 or so. Then the regional ISP would allocate subnets of the
> supernet to their customer - say /24s.
>
> I also assume the regional ISP would not require an AS number since they are
> not implementing BGP. Basically, all traffic from the regional ISP and
> customers is default routed to the single upstream connection.
>
> Are these assumptions valid? Is this a good configuration? I realize
> multiple upstreams from different providers is optimal, however not
> plausdable in this case.
>
> Your constructive insight to the scenario is appreciated.
>
> Chas
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