While I think the address planning problem is serious and hinges
directly on this issue, I believe all these opinions and stances have
been repeated so often here and elsewhere that I for one would like to
hear something new.
To my mind the question is simple.
Decades or Centuries?
[email protected] wrote:
"IIRC, RIPE allocated a /19 to France Telecom. Doesn't take more than a few hundred
thousand allocations like that one to wipe out the IPv6 address space."
Do we expect a few hundred thousand places that need 2^29 (500M, give or
take(OTTOMH)) /48s? Didn't we _just_ get to seeing ~64k ASNs as a limiting
factor?
/TJ
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: William Herrin <[email protected]>
Date: Fri, 14 Aug 2009 16:52:42
To: Jeroen Massar<[email protected]>
Cc: Nanog<[email protected]>
Subject: Re: IPv6 Addressing Help
On Fri, Aug 14, 2009 at 2:40 PM, Jeroen Massar<[email protected]> wrote:
William Herrin wrote:
[..]
I'm not aware of any way of dynamically assigning an IPv6 subnet to a
customer that's as well automated as IPv4 /32 dynamic assignment to a
DSL router with an RFC1918 NATed interior, but that may just be my
ignorance since I haven't needed to research it.
DHCP-PD (prefix delegation)
Hi Jeroen,
Cool. So we'll have $100 CPE which uses it in a relatively idiot-proof
manner sometime between now and eternity.
Static IP customer: /60
ARIN defines a /56 minimum. That is the reason that ISPs get a /32.
RIPE defines a /48 at the moment.
ARIN "defines" a /64 minimum customer assignment and suggests /56.
They go on to say that, "RIRs/NIRs are not concerned about which
address size an LIR/ISP actually assigns."
See ARIN NRPM 6.5.4.1. https://www.arin.net/policy/nrpm.html#six54
I recommend /60 as the customer default where most folks suggest /56
or /48. The IPv6 use profile looks a heck of a lot like the IPv4 use
profile and /60 is 16 subnets. How many of your customers find a
reason to use more than 3 IPv4 subnets, including their RFC1918 ones?
Relatively few.
Think Future. And why bother with that anyway. If you as an ISP needs
more address space just ring RIPE/ARIN/APNIC and ask for more, they will
happily give it to you.
The future looks a lot like the past but with more blinking lights.
Seriously, I'm pretty nuts when it comes to networking. My basement is
AS11875, multihomed with about 35mbps of bandwidth. If I can't imagine
how *I* would use more than 16 subnets then it's a safe bet that many
years will pass before Joe random DSL customer wants to.
The world won't end, even if you assign every customer a /48. But why
be so grossly wasteful *before* anyone has demonstrated a practical
use for doing so?
I guess you ran the numbers on how to run out of IPv6 address space?
IIRC, RIPE allocated a /19 to France Telecom. Doesn't take more than a
few hundred thousand allocations like that one to wipe out the IPv6
address space.
Regards,
Bill Herrin
