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

> 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.

So the effect is that the first time a node appears on the link
the AR helps it to provide faster DAD, but when it returns
after having visited some other link (or "returns" after being out of
reach) it will need to wait for the 1 second DAD delay?

And since NCE entries don't have any explicit timeout (per RFC 2461
they are only removed if the node runs low on memory or if NUD fails
when trying to communicate with the neighbor) the NCE might be there
when the node returns after being gone for a day or longer.

Note that with this proposed modification to DAD behavior the AR can never
garbage collect the NCE entries since that might cause it
to send a "no duplicates" response when there might be a duplicate.
So how could the NCE entries ever be safely removed from the AR?

  Erik