North American Network Operators Group|
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Re: v6 subnet size for DSL & leased line customers
On Thu, 20 Dec 2007 12:26:43 +0900 Randy Bush <[email protected]> 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"