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RE: [moonv6] /120 prefix length at UNH

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From: Bound, Jim (jim.bound@hp.com)
Date: 10/15/03


moonv6 post from "Bound, Jim" <jim.bound@hp.com> Good response.

OK I would suggest the EUI can be part of the prefix 

......................that does not break 3315.  The only thing that
breaks 3315 is if there is no way to extrapolate the EUI a routing prefix does not preclude that is where I am????

/jim

> -----Original Message-----
> From: Alain Durand [mailto:Alain.Durand@Sun.COM]
> Sent: Wednesday, October 15, 2003 1:05 PM
> To: Bound, Jim
> Cc: schultz@io.iol.unh.edu; moonv6@iol.unh.edu
> Subject: Re: [moonv6] /120 prefix length at UNH
>
>
>
>
> Bound, Jim wrote:
>
> >With /120
> >
> >m = 8. n == variable depending on prefix format. this is
> aggregatable
> >format. so the prefix stops at /64 and low order 64 is the
> EUI. meaning
> >n MUST not be greater than 58. 58 + 8 == 64. So what I am
> saying is I
> >beleive /120 or /96 does not step on the EUI but a /8 does
> step on the
> >EU and does break 3315?
> >
>
> | n bits | m bits | 128-n-m bits |
> +------------------------+-----------+----------------------------+
> | global routing prefix | subnet ID | interface ID |
> +------------------------+-----------+----------------------------+
>
> I think you might have been loonking at the picture right to
> left instead of left to right! (just kidding)
>
> With /120, you have:
>
> | 120 bits | 8 bits |
> +------------------------+-----------+----------------------------+
> | global routing prefix + subnet ID |interface ID|
> +------------------------+-----------+----------------------------+
>
>
> Ok? So your Interface ID is effectively 8 bit long. This
> breaks 3315 as the global routing prefix is not starting with 000/3.
>
> - Alain.
>
>

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