nanog mailing list archives
Re: Assigning IPv6 /48's to CPE's?
From: "Rick Astley" <jnanog () gmail com>
Date: Thu, 3 Jan 2008 04:21:18 -0500
On Jan 3, 2008 3:52 AM, Rick Astley <jnanog () gmail com> wrote:
Take someone like Comcast with ~12 million subscribers.It would take an IPv6 /24 to get 16.7 million /48's (2^24). With a netefficiency of 10% they are going to need to be allocated 120 million /48's. It would take a /21 to give them 2^(48-21) = ~134 million /48's.So in short, a /48 to subscribers seems like complete overkill, and a /32to ISP's seems completely inadequate (80 vs 16 bits).I thought one of the goals of IPv6 was to assign ISP's huge blocks withlow utilization so they don't have push a bunch of individual prefixes out to the worlds routing tables?It seems to me while being extra super sure we meet goal 1 of making sureNAT is gone for ever (and ever) we fail goal 2 of not allocating a bunch of prefixes to ISP's that are too small.
PS. say for example we would like to meet goal 2 while giving customers /48's at the same time. We decide a an initial projected utilization of 1% or .1% is more appropriate for Comcast. In order to give them 1.2 billion /48's (1% utilization), they would need 2 /18's. For 12 billion (0.1% utilization), they would need a /14. In which case the depletion of IPv6 space starts to seem possible. Your response might be "Why would an ISP need 0.1% utilization?" My answer: "Why would a customer need 0.000000000000000000000001%utilization?"
Current thread:
- Re: Assigning IPv6 /48's to CPE's? James Hess (Jan 01)
- Re: Assigning IPv6 /48's to CPE's? Joe Greco (Jan 01)
- Re: Assigning IPv6 /48's to CPE's? Christopher Morrow (Jan 01)
- Re: Assigning IPv6 /48's to CPE's? Christopher Morrow (Jan 01)
- Re: Assigning IPv6 /48's to CPE's? Randy Bush (Jan 02)
- Re: Assigning IPv6 /48's to CPE's? Rick Astley (Jan 02)
- Message not available
- Re: Assigning IPv6 /48's to CPE's? Rick Astley (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Mikael Abrahamsson (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Rick Astley (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Randy Bush (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Christopher Morrow (Jan 01)
- Re: Assigning IPv6 /48's to CPE's? Rick Astley (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? michael.dillon (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? sthaug (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? michael.dillon (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? Donald Stahl (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? michael.dillon (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? Donald Stahl (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Donald Stahl (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Chris Adams (Jan 03)
- RE: Assigning IPv6 /48's to CPE's? michael.dillon (Jan 03)
- Re: Assigning IPv6 /48's to CPE's? Mark Andrews (Jan 03)