[arin-discuss] Trying to Understand IPV6

[Ron Cleven]

I was with you right with you (assign /48 to every customer, no 
exceptions) up until you came up with the big-isp exception (assign /56 
to private residences).

Why would Comcast (using your example) customers get "only" a /56?

Is there something wrong with the math (are big-isp's going to run out 
of /48's)?

If it is ok for Comcast customers to get /56's, why isn't it ok for all 
other private residences to get /56's (what are the /56 customers giving 
up)?

As usual, I am horribly confused.



michael.dillon at bt.com wrote:

>
>
>It is very typical. /48 to every customer, no exceptions. If a customer
>wants less, assign them a /48 anyway and only tell them the first part
>of the prefix. When they get wiser, tell them the /48 that you 
>"reserved" for them. 
>
>The non-typical case is an ISP with very large numbers of residential
>customers (something like Comcast for instance) where it makes sense
>to assign /56 to private residences and /48 to everyone else.
>
>  
>

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