On Wed, Jul 20, 2011 at 09:15:56AM -0700, Stephen Hemminger wrote:

quoted

When the cable is unplugged and plugged in again, we already get
notified through linkwatch -> netdev_state_change ->
  -> call_netdevice_notifiers(NETDEV_CHANGE, ...)
However, if the device has already been autoconfigured,
addrconf_notify() only handles this event by printing a
message.

...

If the driver drops the link during suspend then the necessary link
events happen to keep bridging, ipv6, bonding and all the other possible
network protocols happy.

OK, so maybe providing the link event on suspend/resume should be
left to the drivers.

The main problem persists: IPv6 currently does nothing when the link goes
down and returns. Shouldn't the kernel anticipate that the new
network could be different, forget all the autoconfigured
parameters and restart the autoconfiguration?

-- 
Jiri Bohac [off-list ref]
SUSE Labs, SUSE CZ