[dhcwg] DUID+IAID

Sorry, forgot to put a subject line...

On Thu, Mar 29, 2012 at 10:11 AM, A. Gregory Rabil
<greg.rabil@jagornet.com>wrote:

> Hello DHC WG,
> I am looking for clarification around the IAID.  Some of this stems from
> the several discussions recently regarding the DUID and the lack of a MAC
> address in DHCPv6.
>
> Ted (don't mean to call you out here, but it is prevalent to my question)
> wrote this on the ISC DHCP list:
>
> >DUID+IAID uniquely identifies the interface; DUID uniquely identifies the
> host.
>
> My question is can this be guaranteed?  From RFC 3315:
>
>       Identity association (IA) A collection of addresses assigned to
>                                 a client.  Each IA has an associated
>                                 IAID.  A client may have more than one
>                                 IA assigned to it; for example, one for
>                                 each of its interfaces.
>
> It states "for example, one for each of its interfaces".  So, I don't see
> this as a MUST, or am I missing something?
>
> If the IAID is intended to identify the interface, then I wonder why that
> is not just the MAC address.  If that were the case, then every request
> would contain the DUID identifying the device, and the IAID to identify the
> actual interface in which the request was made.  I guess my concern is that
> if we start putting the MAC address in the DHCPv6 packet (which I am in
> favor of), then we should be sure to specify how it does or does not relate
> to the IAID.
>
> Regards,
>
> Greg Rabil
>
>
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