[dhcwg] Re: mboned: draft-jdurand-assign-addr-ipv6-multicast-dhcpv6-00 comments

On Sun, 1 Aug 2004, Stig Venaas wrote:
[...]
> I see some possible issues. There might be a need for giving hosts
> different prefixes for different scopes (you could imagine having
> one prefix where simply the scope bits are set to whatever scope
> is needed). I think there are cases where you might use say
> Embedded-RP internally (with small scope) and prefix-based addressing
> externally (with larger scope) or vice versa. Or where you may want
> different RPs for different scopes.

Well, one obvious way to achieve all of this is to add a Multicast
Prefix Information option (a tailed down version of PI option), to
RFC2461/RFC2462 Route Advertisements, and specification of multicast
DAD (possibly with a flag in the MPI whether it's needed or not).

With that, multiple prefixes could be advertised, but typically one
would be enough.

(The "good news" here is that a good implementation would not need to 
require the router admin to specify the prefix to be advertised on all 
the links, but it could be calculated & advertised automatically as 
well.)

Additionally, individual addresses could also be dealt with DHCPv6 or
something, but I personally don't see that as equally attractive.. but
in cases where this is attractive IMHO manual addressing, as it's done
today, is probably typically more lucrative..

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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