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RE: [moonv6] /120 prefix length at UNH

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From: Ed Remmell (eremmell@elmic.com)
Date: 10/15/03


moonv6 post from "Ed Remmell" <eremmell@elmic.com> Hosts are still restricted to using EUI-64 interface IDs, w/ regards to Stateless Address Auto-Configuration. So, a host cannot auto-configure from a /120 prefix. You can advertise a /120 prefix in a RA Prefix Information Option, but that doesn't make too much sense to do so, since any host compliant with the RFCs will not be able to configure from such a prefix. If you want to instead use DHCPv6 or manual address configuration, then it doesn't really matter, you can choose the prefix length to be as long as you'd like in that case IMHO.

Thanks.
- Ed

> -----Original Message-----
> From: owner-moonv6@io.iol.unh.edu
> [mailto:owner-moonv6@io.iol.unh.edu] On Behalf Of Bound, Jim
> Sent: Wednesday, October 15, 2003 10:09 AM
> To: Alain Durand
> Cc: schultz@io.iol.unh.edu; moonv6@iol.unh.edu
> Subject: RE: [moonv6] /120 prefix length at UNH
>
>
> 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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