[Mip4] Clarification for Dynamic HA assignment draft

Hi, Alpesh,

I think we should attempt to be compatible with the functionality
specified in the Mobile IPv4 Diameter specification, which is inside
Section 1.4 of draft-ietf-aaa-diameter-mobileip-14.txt:

1.4  Allocation of Home Agent in Foreign Network

   The Diameter Mobile IP application allows a home agent to be
   allocated in a foreign network, as required in [MIPREQ, CDMA2000].
   When a foreign agent detects that the mobile node has a home agent
   address equal to 0.0.0.0 or 255.255.255.255 in the Registration
   Request message, it MUST add a MIP-Feature-Vector AVP with the Home-
   Agent- Requested flag set to one. If the home agent address is equal
   to 255.255.255.255, then the foreign agent also MUST set the Home-
   Address-Allocatable-Only-in-Home-Realm flag equal to one. If the home
   agent address is set to 0.0.0.0, the foreign agent MUST set the Home-
   Address-Allocatable-Only-in-Home-Realm flag equal to zero.

So yes, both values are used to request dynamic home agent, however,
one of them (255.255.255.255) indicates a preference for home realm
based HA while the other (0.0.0.0) represents that the MS doesn't care
whether the HA is in the home or visited realms.

-Pete

Alpesh writes:
 > Pete:
 > 
 > This is regarding your comment/observation in last IETF while Kent
 > was presenting the Dynamica HA assignment framework draft.
 > 
 > Currently, we are proposing to use either 0.0.0.0 or 255.255.255.255
 > as the HA address to indicate dynamic HA assignment. I cross-checked
 > IS-835C and they use these addresses interchangeably.
 > 
 > You mentioned that some other draft is trying to separate the meaning of
 > all zero and all ones. My concern is that, it the meaning is not already 
 > defined,
 > should we rely on that draft? We want to accomodate the 3GPP2 model and
 > since they are using both values to mean dynamic HA assignment, we want to
 > go on that path.
 > 
 > In future, if different meanings get assigned to each value, we can 
 > probably change
 > our draft.
 > 
 > Do you have comments/suggestions??
 > 
 > -a

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