v6 subnet size for DSL & leased line customers

Randy Bush randy at psg.com
Sat Dec 29 05:26:28 UTC 2007

> It plausible that if one were to assign a single /64 and reserve a 56 to
> delegate per customer

as a provider, where is the win in this for me?  the space is 'lost',
i.e. committed, and i increase provisioning hassles, though maybe mildly
if i am skillful.  if/when the rirs sober up about ipv6 justification, i
will have a hard time showing an hd ratio without a lot of zeros to the
immediate right of the decimal point.

or would you suggest that i recover the committed space if unused?
under what conditions?  after how long?  and, when i recover, do i
allocate the second (or 42nd) /64 to a new customer, leaving them a
smaller cushion than the first user of that /56 received?

no easy answers.  but yes, giving them a /56 off the bat feels a bit
reminiscent of giving them a /24 in ipv4.


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