Re: Mobility Exposure and Selection WT call

Hi Brian,

> -----Original Message-----
> From: dmm [mailto:[email protected]] On Behalf Of Brian Haberman
> Sent: Monday, April 27, 2015 6:45 AM
> To: [email protected]
> Subject: Re: [DMM] Mobility Exposure and Selection WT call
> 
> 
> 
> On 4/22/15 12:51 PM, Templin, Fred L wrote:
> > Hi Alex,
> >
> >> -----Original Message-----
> >> From: Alexandru Petrescu [mailto:[email protected]]
> >> Sent: Tuesday, April 21, 2015 12:42 PM
> >> To: Templin, Fred L; Jouni Korhonen; [email protected]
> >> Subject: Re: [DMM] Mobility Exposure and Selection WT call
> >>
> >> Le 31/03/2015 00:42, Templin, Fred L a écrit :
> >>> Hi Alex,
> >>>
> >>>> -----Original Message----- From: dmm [mailto:[email protected]]
> >>>> On Behalf Of Alexandru Petrescu Sent: Thursday, March 26, 2015 3:03
> >>>> PM To: Jouni Korhonen; [email protected] Subject: Re: [DMM] Mobility
> >>>> Exposure and Selection WT call
> >>>>
> >>>> Le 26/03/2015 13:17, Jouni Korhonen a écrit :
> >>>>> Alex,
> >>>>>
> >>>>> 3/26/2015, 11:00 AM, Alexandru Petrescu kirjoitti:
> >>>>>
> >>>>> [snip]
> >>>>>
> >>>>>>> I thought by "fixed" you meant it stays the same wherever the
> >>>>>>> Host goes (something like the Home Address).
> >>>>>>
> >>>>>> Alper - I think a LL address can also be qualified as 'fixed' -
> >>>>>> it never changes.
> >>>>>
> >>>>> Does LL here mean link-local or link-layer? If it is the former
> >>>>> one, then the above assertion is not correct.
> >>>>
> >>>> Link-local.
> >>>>
> >>>> And you seem to say a link-local address is not fixed?  I think
> >>>> link-local addresses _are_ fixed set in stone.  They are formed
> >>>> locally without need of help from router.
> >>>
> >>> AERO provides a fixed link-local address that is formed from a
> >>> prefix received by DHCPv6 Prefix Delegation (PD).
> >>
> >> Fred - but why should this ll prefix be provided by DHCP?  Is it of
> >> variable value?  Or is the link-local constant all the time? (in which
> >> case it could be hardcoded everywhere).
> >
> > DHCPv6 Prefix Delegation delegates an IPv6 prefix to the AERO
> > Client (e.g., 2001:db8:1:2::/64). The Client then constructs an
> > AERO link-local address from the prefix as fe80::2001:db8:1:2
> > (i.e., it embeds the 64-bit prefix from the prefix delegation in
> > the 64-bit interface identifier of an IPv6 link-local address).
> 
> So, it is not actually a link-local address per the IPv6 Addressing
> Architecture (https://tools.ietf.org/html/rfc4291#section-2.5.6).

Just because the AERO address Interface ID is not formed via EUI-64
does not mean that it is not a link-local address (see RFC7136, which
updates RFC4291). RFC7421 gives further commentary.

Thanks - Fred
[email protected]

> Regards,
> Brian