Re: Delivering HA FQDN to MN via dhc-jang

hi Alper,

Alper Yegin wrote:

> > > This would be useful in the presence of IP address
> > > renumbering
> >
> > I dont think involving NAS in home link renumbering is the right
> > thing. renumbering is not done abruptly. there is a period in
> > which both prefixes (the old and the new) are valid.
>
>
> NAS is not involved in renumbering....
>
> Storing the FQDN of an HA instead of its IPv6 address in a DHCP server
> provides immunization to changes in the IP address of the HA (for any
> reason).

we have mechanisms to convey changes in the prefix information on
the home link.

> DNS can give you different IP address depending on where the request is
> coming from (for localization, etc). 

are you sure? I thought you always get back all A records. not
region specific A records. correct me if I am wrong.

I would prefer the AAAH (or an entity in the home network) making
the decision to assign a local HA based on where the MN is. not
the DNS.

> So, by advertising the FQDN of a HA
> (rather than the fixed IP address) a deployment can take advantage of
> this DNS feature.
>
> These are potential reasons for delivering FQDN rather than IPv6 address
> of an HA to the MN.

I thought your initial question was about sending FQDN in addition
to the IPv6 address of the HA.

> During a private discussion Pascal suggested adding the home agent FQDN
> to possible types of information deliverable to MNs via
> draft-jang-dhc-haopt-00.txt (in addition to HA IPv6 address and home
> subnet prefix). This would be useful in the presence of IP address
> renumbering or with DNS-based discovery schemes.

Vijay