[175052] in North American Network Operators' Group
Re: IPv6 Default Allocation - What size allocation are you giving out
daemon@ATHENA.MIT.EDU (James R Cutler)
Wed Oct 8 22:49:00 2014
X-Original-To: nanog@nanog.org
From: James R Cutler <james.cutler@consultant.com>
In-Reply-To: <495D0934DA46854A9CA758393724D5906DA244@NI-MAIL02.nii.ads>
Date: Wed, 8 Oct 2014 22:48:48 -0400
To: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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On Oct 8, 2014, at 9:18 PM, Erik Sundberg <ESundberg@nitelusa.com> =
wrote:
> I am planning out our IPv6 deployment right now and I am trying to =
figure out our default allocation for customer LAN blocks. So what is =
everyone giving for a default LAN allocation for IPv6 Customers. I =
guess the idea of handing a customer /56 (256 /64s) or a /48 (65,536 =
/64s) just makes me cringe at the waste. Especially when you know 90% of =
customers will never have more than 2 or 3 subnets. As I see it the =
customer can always ask for more IPv6 Space.
>=20
> /64
> /60
> /56
> /48
>=20
> Small Customer?
> Medium Customer?
> Large Customer?
>=20
> Thanks
>=20
> Erik
>=20
Erik,
Selection of a default prefix is easy. Here are the steps.
1. Design your address allocation systems using /48.
2. Estimate your ongoing address management costs using /48.
3. For each +4 in prefix length, estimate doubling your long term =
address management costs.
4. Keeping in mind=09
4.1 Prefixes longer than somewhere around /48 to /56 may be =
excluded from the global routing table
4.2 Your customers want working Internet connections
4.3 You want income at a minimum of ongoing expense
make a sensible business decision.
Easy-peasy.
James R. Cutler
James.cutler@consultant.com
PGP keys at http://pgp.mit.edu
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