Re: [MEXT] [mext] #11: De-registration when returning home [VijayDevarapalli <vijay at wichorus.com>]

["Benjamin Lim" <benjamin.limck at sg.panasonic.com>]

Hi Vijay, 

One comment on the new proposed text.

> NEW:
> 
>    A mobile node detects that it has returned to its home link through
>    the movement detection algorithm in use (Section 11.5.1), when the
>    mobile node detects that its home subnet prefix is again on-link.
>    In case the mobile node has only one care-of address 
> associated with
>    the home address, it MUST send a Binding Update to its home agent,
>    to instruct its home agent to no longer intercept or tunnel packets
>    for it.  
[Ben] This part I agree. When the MN returns home, MN must send a BU to HA
to remove its CoA entry from the HA.

> In case the mobile node has more than one interface and
>    can bind more than one care-of address to the home address, the 
>    mobile MAY send a Binding Update to its home agent, to 
> instruct its 
>    home agent to no longer intercept or tunnel packets for 
> it. 
[Ben] IMHO, this should also be a MUST. Base on the same logic as above.
This is irrespective to whether MN is trying to achieve simultaneous home
and away or not.  Regardless on whether if MN has one CoA or multiple CoAs,
when MN returns home, it would need to remove its associated CoA entry from
the HA.  Hence, I do not see a reason why for one CoA MN MUST send BU, but
for multiple CoAs MN MAY send BU.

Regards,
Benjamin Lim

> For more
>    information on the mobile node returning home procedure when there 
>    are multiple care-of addresses, see [MCOA].
> 
> In the Informative references add,
> 
>    [MCOA] Wakikawa, S., Devarapalli, V., Ernst, T., and K. Nagami, 
>           "Multiple Care-of Addresses Registration", Work in 
>           Progress, May 2008.
>    
> Hope this acceptable to all.
> 
> Vijay


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