All Subnets must be /64, all hosts must use EUI-64? (According to RFC3513)

[Merike Kaeo]

  Are you going to start the /126 vs /64 pt-to-pt discussion  
again? :) :)

Enough people do /126s and most products support it that I've come  
across.  Although someone once did tell me "If you want to make sure  
it works use /64s".

I typically look at what products do and while most try and conform  
to RFCs there's plenty of deviations.

- merike

On Jun 2, 2009, at 12:18 PM, Mikael Abrahamsson wrote:

> On Tue, 2 Jun 2009, Erik Kline wrote:
>
>> Also: 3513 was obsoleted by http://tools.ietf.org/html/rfc4291  
>> (one reason I prefer the tools.ietf.org links).
>
>> From 2.5.4 in RFC4291:
>
> "All Global Unicast addresses other than those that start with binary
>    000 have a 64-bit interface ID field (i.e., n + m = 64),  
> formatted as
>    described in Section 2.5.1.  Global Unicast addresses that start  
> with
>    binary 000 have no such constraint on the size or structure of the
>    interface ID field."
>
> This still seems to imply that you really have to have a 64bit  
> interface ID field in there, formatted per 2.5.1. So how does /126  
> fit into that?
>
> -- 
> Mikael Abrahamsson    email: swmike at swm.pp.se
>