[dhcwg] RFC3315 DECLINE definition

[Simon Hobson]

김우태(Network Innovation Projec) <utae.kim at kt.com> wrote:

> I think IPv6 is co-existed with IPv4 for a while.
> Devices have dual stack with IPv4 and IPv6 address.
> And there are cases that traces the problem with IPv4 & IPv6 address information.
> But, now there have no common key between them.
> So, I think IPv6 information is included with device mac address for tracing IPv4.

If I understand you correctly, you are describing a completely separate issue - that of identifying the MAC-IP pairing for IPv6 because your IPv4 workflow is based on that.
That too has been done to death in the DHC WG list - to the extent that (IIRC) there is now a MAC address option defined that clients may send, or was it that relay agents could add ? I think it might have been the latter since it's easier to upgrade a few relay agents rather than every client.
For devices not using a relay agent, the MAC address is in the packet.
Also, there's been quite firm statements that the wording of the RFCs that prohibits "looking inside" the client identifier does not in fact prohibit that, although since on a multi-homed device that may not be based on the same interface, it's not necessarily all that useful anyway.