Re: draft-gont-6man-slaac-renum-01

[Erik Kline <[e-mail]>]

To restate thoughts from IEPG this morning and from hallway
conversations thereafter, I think it would suffice to add some
"loopback detection".  Basically, if a host has cause to think a
router no longer routes a PIO onto a link it should start some prefix
unusability detection.

This would basically be a host sending a packet from itself to itself
via the router.  The destination address should be a GUA from the PIO
formed on the interface, but the contents and source address I'm less
sure of (could be from link-local or the same GUA or a different
on-link GUA, could be a ping or a unicast NS or a UDP packet to a port
the host opens, ...).

If a positive packet reflection occurs then that router still routes
the PIO onto the link. If there's no such response within $TRIES
across $SECONDS, then assume that router doesn't forwarding that PIO
onto the link.  (Note that the PIO might still be valid on-link as
specified by a 2nd router...)