Re: [RRG] Providers and providers

[Marshall Eubanks <tme@multicasttech.com>]

On Aug 20, 2008, at 9:49 AM, Iljitsch van Beijnum wrote:

> On 20 aug 2008, at 12:43, RJ Atkinson wrote:
>
> > Large corporations that have large networks are ISPs.
> > They might be ISPs with themselves as the only customer,
> > but they are effectively the same as an ISP.
>
> Right.
>
> So this isn't a problem. If the average fortune 500 company has 500  
> offices in different locations and aggregates those 500 offices into  
> a single PA prefix, we end up with 500 prefixes in the routing  
> table. The trouble start when they don't act as an ISP and have each  
> office connect to the internet independently - but they still want  
> portable address space. In that case, we end up with 250k prefixes  
> in the routing table.

I don't get this math. I know of enterprises with N offices that have  
N address blocks, but the number
of prefixes grows as order (N) not order (N^2). Where does the order  
(N^2) come from ?

Regards
Marshall


> But the bigger problem is what happens with smaller organizations.  
> If a fortune 500 company can get X prefixes (where X = 1 or X =  
> number of offices) then why wouldn't a smaller company be entitled  
> to the same (relative) number of prefixes?
>
> We used to have the requirement that you'd number 200 end-users out  
> of your prefix to be able to get an IPv6 address block, but that was  
> seen as unworkable for a large number of reasons, some of them even  
> valid.
>
>
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