Re: I-D ACTION:draft-hoon-mobileip-undad-00.txt

> Jae-Hoon and Youn-Hee,
>
> I think there is another problem with this draft... the router doesn't
> know when a host leaves the link (i.e. due to link movement), therefore
> if the MN leaves link A to move to a new link B and then in some short
> time (i.e. 20 seconds or so) returns back to link A, the router will
> think that the MN never left link A, when the MN queries the router if
> its care-of address is already in use the router will respond that it
> is. This would cause the MN to fail to configure the care-of address it
> used before on link A.
>
> Thanks.
> - Ed
>
Thank for your good comment.

In this case, router have a NCE for CoA. So, router never reply to MN.
Refer to my draft.

   3.2 AR's requirement
   -  Access router should reply to the sender which has sent NS message
      with the 'A' bit set in the 4th reserved field in NA if access
      router has no entry corresponding to the target address.
      =====================================
   4.1 Mobile node's operation