nanog mailing list archives
Re: IPv6 Addressing Help
From: Nathan Ward <nanog () daork net>
Date: Thu, 20 Aug 2009 09:36:12 +1200
On 16/08/2009, at 1:29 AM, William Herrin wrote:
Start with: /32 Sparsely allocate 200 /56's Total remaining space: in excess of /33. In fact, you haven't consumed a single /48. Expandability by altering the netmask: to /40 Largest allocation still possible: only /40
My suggestion was to sparsely allocate /48s to push addresses to POPs (or something topologically relevant to your network, maybe even NASes) as required.
So, 200 /56s, sparsely allocated, would still be one /48 (or however many /48s you want to have around your network, as above).
Sparse allocation within each of those /48s is also potentially a good idea - case by case. Doesn't make sense on an ADSL pool where everyone has the same length. Makes sense where you're assigning address space to customers who are likely to have different prefix lengths.
Sparse allocation of /48s within a /32 has the advantage of letting you grow each area of your address space in each area independently. You can put one /48 in one POP or NAS or something, and 10 in another, without having to break any of your addressing architecture rules.
/48s seem flexible enough to me, but perhaps you want to use this technique with /44s or /40s, or something.
-- Nathan Ward
Current thread:
- RE: IPv6 Addressing Help, (continued)
- RE: IPv6 Addressing Help Ray Burkholder (Aug 17)
- Re: IPv6 Addressing Help Mark Andrews (Aug 17)
- Re: IPv6 Addressing Help Steve Bertrand (Aug 17)
- RE: IPv6 Addressing Help Antonio Querubin (Aug 17)
- Re: IPv6 Addressing Help Fredy Kuenzler (Aug 14)
- Re: IPv6 Addressing Help Nathan Ward (Aug 14)
- Re: IPv6 Addressing Help William Herrin (Aug 14)
- Re: IPv6 Addressing Help Randy Bush (Aug 14)
- Re: IPv6 Addressing Help Nathan Ward (Aug 15)
- Re: IPv6 Addressing Help William Herrin (Aug 15)
- Re: IPv6 Addressing Help Nathan Ward (Aug 19)
- Re: IPv6 Addressing Help Jack Bates (Aug 19)
- Re: IPv6 Addressing Help William Herrin (Aug 14)
- Re: IPv6 Addressing Help William Pitcock (Aug 15)