Re: Adoption Call for "Improving the Robustness of Stateless Address Autoconfiguration (SLAAC) to Flash Renumbering Events"

[Philip Homburg <[e-mail]>]

> I'll repeat my previous recommendation that a host can unicast an
> NS from any of its GUAs in a suspected lost PIO for the router's
> link-local address to the link-local address of the router.  Treat
> it like NUD -- RRUD, return routing unreachability detection.

Personally I think that this is too complex for what it brings. However,
such a feature may have unexpected benefits. So I think it worth adding
this to the draft as an alternative to be able to see what a fully worked out
proposal would look like.

A slight variation that might work, is for a host to perfom NUD on the router's
address using the source address it is going to use. In that case the host
would not wait for a RA to arrive but always do that. 

The added complexity is that the host would have to do NUD per source address.
The added benefit is that the host would always verify that a particular source
address works for a given next hop.