[116713] in North American Network Operators' Group
Re: IPv6 Addressing Help
daemon@ATHENA.MIT.EDU (Jeroen Massar)
Fri Aug 14 14:41:24 2009
Date: Fri, 14 Aug 2009 20:40:06 +0200
From: Jeroen Massar <jeroen@unfix.org>
To: William Herrin <herrin-nanog@dirtside.com>
In-Reply-To: <3c3e3fca0908141133j73b26fd8o1066c93c846205e8@mail.gmail.com>
Cc: Nanog <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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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)
> 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.
[..]
> 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.
> Giving every customer enough subnets by default to meet 90% of the
> typical usage profiles is not the worst idea in the world... IMHO it's
> a pretty bright idea. But there's no need to be damnfool wasteful
> about it.
I guess you ran the numbers on how to run out of IPv6 address space?
You can always ask the US DoD for a few /32s, they have enough of them...=
Routing will become a problem before IPv6 address space will run out.
Oh, and we are only allocating from 2000::/3 at the moment, can retry on
the other 7 /8s....
Greets,
Jeroen
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