[135518] in North American Network Operators' Group
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
daemon@ATHENA.MIT.EDU (Owen DeLong)
Wed Jan 26 04:20:08 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <4D3FBF8E.8070605@gont.com.ar>
Date: Wed, 26 Jan 2011 01:14:43 -0800
To: Fernando Gont <fernando@gont.com.ar>
Cc: nanog@nanog.org, carlos@lacnic.net
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jan 25, 2011, at 10:30 PM, Fernando Gont wrote:
> On 24/01/2011 05:53 p.m., Ray Soucy wrote:
>> Every time I see this question it' usually related to a fundamental
>> misunderstanding of IPv6 and the attempt to apply v4 logic to v6.
>>
>> That said. Any size prefix will likely work and is even permitted by
>> the RFC. You do run the risk of encountering applications that assume
>> a 64-bit prefix length, though. And you're often crippling the
>> advantages of IPv6.
>
> Just curious: What are the advantages you're referring to?
>
1. Sparse addressing
2. SLAAC
3. RFC 4193 Privacy Addressing
4. Never have to worry about "growing" a subnet to hold new machines.
5. Universal subnet size, no surprises, no operator confusion, no bitmath.
There are probably others.
Owen
