Re: v6 subnet size for DSL & leased line customers

> 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.

randy

On Thu, 20 Dec 2007 12:26:43 +0900
Randy Bush <randypsg.com> wrote:

> 
> > 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?
> 

Why not a /48 for all? IPv6 address space is probably cheap
enough that
even just the time cost of dealing with the occasional
justification
for moving from a /56 to a /48 might be more expensive than
just giving
everybody a /48 from the outset. Then there's the op-ex cost
of
dealing with two end-site prefix lengths - not a big cost,
but a
constant additional cost none the less.


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

-- 

        "Sheep are slow and tasty, and therefore must
remain constantly
         alert."
                                   - Bruce Schneier,
"Beyond Fear"