v6 subnet size for DSL & leased line customers

Randy Bush randy at psg.com
Thu Dec 20 03:26:43 UTC 2007

> I work on a network with 100K+ DSL folks and 200+ leased line
> customers, plus some other stuff.  The leased line customers are
> increasing dramatically.  I should plan for a /64 for every DSL
> customer and a /48 for every leased line customer I expect over the
> next 5-7 years?

why not a /56 by default for both, and give them an opportunity to
justify more?

a /64 is a bit old-think unless you are having cost issues getting your
space from above.


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