Re: [DNA] Model: how to treat "link down" events

[Erik Nordmark <erik.nordmark@sun.com>]

Mohan.Parthasarathy@nokia.com wrote:

> I agree with this. But i found this in 2462bis.
> 
>    A node forms a link-local address whenever an interface becomes
>    enabled.  An interface may become enabled after any of the following
>    events:
> 
>    -  The interface attaches to a link for the first time.  This
>       includes the case where the attached link is dynamically changed
>       due to a change of the access point of wireless networks.
> 
> What does it mean to form a new link-local address when you switch
> Access Points ? Does it mean throw away the old link-local address ?
> Only the link-local address ? I don't remember the discussion that lead
> to the above text. It sure does not say "throw away the old info".

It doesn't make much sense, since the link-local address (for most 
IPv6-over-foo specifications) is formed from some hardware IEEE address, 
thus forming it again would result in generating the same link local 
address.

There is a legitimate question of when a host should redo (optimistic) 
DAD, but that is something which makes sense specifying in the DNA 
document(s) and not in 2462bis.

    Erik