Re: Mobility Exposure and Selection WT call

Brian Haberman <[email protected]> Mon, 27 Apr 2015 09:45:12 -0400
Newsgroups	gmane.ietf.nemo
Message-ID	<[email protected]>

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).

Regards,
Brian

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