Re: [dhcwg] Dual stack issues

Hi Vijay!

I agree with Stig in his mail (Stig: could you be so kind a post your
response to the list? tnx!) saying that we have fundamentally different
views. Having DHCPv4 only convey v4 information and DHCPv6 only v6
information is only one view. Another view is to regard DHCPv6 merely as
means of transport. If I remember correctly, there's no statement in RFC
3315 saying that you must only transport IPv6 information with DHCPv6.

Additionally, there are a number of paradigms in DHCPv6 that we miss in
DHCPv4 in our day to day operations, e.g. going away from using MACs for
per-host address assignment but instead use DUIDs/IAIDs etc.. I see a
real gain of administrative comfort in using DHCPv6 for transporting
IPv4 information.

> eg:- SLP. In this way the problem exists still. So, I guess the best way 
> to deal with the issue, rather than duplicating dhcpv4 options, its good 
> to refer as IPv4 mapped IPv6 addresses. But still I am not convinced 
There're cases where this is not desirable e.g. when using broadcast
address options for IPv4 which only make sense as suboptions of
OPTION_IAADDR_IPv4.

> parameters. They should be disjoint list configured by an intelligent 
> admin. Thats it.
Well, from an admin's point of view it's practical to only have to
administrate DUIDs and IAIDs for dual-stack hosts, not MAC addresses as
well.

> overloaded dhcpv6 client.I couldn't get a reason why there should be 
> single dhcpclient. Am I missing something here?
The issues listed in draft-chown-dhc-dual-stack-00 can be solved by
having such a single client. Putting aside whether this is a pure DHCPv6
client that can request IPv4 information options or if it is a combined
DHCPv4/-v6 client, it is an elegant solution to the problems outlined
there.

Cheers,
Christian
-- 
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