[AusNOG] IPv6 Addressing

Wed Apr 6 14:23:19 EST 2011

Some additional reasons,
- Recommended by RFC3177 and IAB/IESG.
- Consistency of /64 makes management easy
- /64 is a MUST if you are planning to use Stateless Address
AutoConfiguration (SLAAC), (MSFT DHCPv6 also) for assignment of ipv6
prefixes.

To address concerns of those who do not like to waste 18.466 Quintillion
addresses on a point to point link, there are special cases which can be
used,
/126-valid for p2p
/127-valid for p2p if you are careful
(draft-kohno-ipv6-prefixlen-p2p-xx/(RFC3627)). Be careful about interop
issues if doing /127
/128-loopback

Cheers
Rohan.

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Michael Christie
(micchris)
Sent: Wednesday, April 06, 2011 1:55 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] IPv6 Addressing

I would suggest:

1) It makes your design simpler: /64 everywhere
2) There are 18,446,744,073,709,551,616 /64s available*

*apart from special/reserved ranges.

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Graham Maltby
Sent: Wednesday, 6 April 2011 1:28 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] IPv6 Addressing

I am probably showing my complete lack of IPv6 knowledge here but can
someone explain the logic or reasoning behind allocating
18,446,744,073,709,551,616 address to a point to point link?  Or suggest
some reading that might clarify that.

Graham

On 5/04/2011 8:27 AM, John Edwards wrote:
> The "safe" way to do it appears to be to administratively allocate a 
> /64 anyway, even if you configure for a longer prefix.
>
> This way if you need to replace interfaces with some equipment that 
> doesn't support a /127 for some reason, or runs more optimally with a 
> /64, or the management software gui insists on it - you don't have to 
> renumber.
>
> John
>
>
> On 04/04/2011, at 11:16 PM, Mark Grinceri wrote:
>
>> I have received our IPv6 allocation from APNIC. Now the question is 
>> what is everyone doing for there point to point links /64, /126 or 
>> /127
>>
>> From what I can gather most articles are just saying use /64, however

>> I'm heading towards /126 but I'd like to know what the majority of
>> IPv6 networks are assigning (ie Internode). I only want to do this
once.
>
>
>
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