v6 subnet size for DSL & leased line customers

Mon Dec 31 21:18:41 UTC 2007

Mark Smith wrote:

> 
> Another idea would be to give each non-/48 customer the
> first /56 out of each /48. If you started out with a /30 or /31 RIR block , by
> the time you run out of /48s, you can either start using up the
> subsequent /56s out of the first /48, as it's likely that the first /56
> customer out of the /48 would have needed the /48 by that time.

As stated, that approach has really negative implications for the number
of routes you carry in your IGP.

> Alternatively you might have become more comfortable with giving each
> customer a /48, and wouldn't require any of them to renumber - they'd
> just have to shorten their prefix length.
> 
> Regards,
> Mark.
> 