Public bug reported:
In Ubuntu 8.10, when a switch or hub is disconnected, NetworkManager
deletes the IP assignment(s) and the routes associated with that
interface. When the switch or hub is reconnected, NetworkManager
recognizes it is back, but fails to do the "ifdown ethX; ifup ethX" or
equivalent to restore the IPs and the routing. This means that merely
powercycling a hub or switch requires logging into each server to
restore the IPs and routing.
Checking "man NetworkManager" gives no advice on how to either turn the
first "feature" of deleting static IP assignments off, or how to enable
NetworkManager to properly work from the assignments in
/etc/network/interfaces to fully bring the interface back up, just in
case it has previously taken it down.
It also doesn't fully take the interface down. It's up, just with no IPs
and no associated routing, from the system's point of view. This is also
a bug.
I've verified this on two different systems. It consistently happens. It
looks like this on being triggered:
Jun 16 14:02:36 green NetworkManager: <info> (eth1): carrier now OFF (device
state 3)
Jun 16 14:02:36 green NetworkManager: <info> (eth1): device state change: 3 ->
2
Jun 16 14:02:36 green NetworkManager: <info> (eth1): deactivating device
(reason: 0).
Jun 16 14:02:36 green NetworkManager: <WARN> check_one_route(): (eth1) error
-34 returned from rtnl_route_del(): Sucess
And this on being restored:
Jun 16 14:03:48 green kernel: [15372693.685407] eth1: link up, 100Mbps,
full-duplex, lpa 0xC5E1
Jun 16 14:03:48 green NetworkManager: <info> (eth1): carrier now ON (device
state 2)
Jun 16 14:03:48 green NetworkManager: <info> (eth1): device state change: 2 ->
3
Jun 16 14:03:48 green kernel: [15372693.686837] ADDRCONF(NETDEV_CHANGE): eth1:
link becomes ready
Jun 16 14:03:59 green kernel: [15372703.856011] eth1: no IPv6 routers present
But there's no restoration of the IPs and routing.
I also suggest that the very inclusion of NetworkManager in Ubuntu is a
bug. But meanwhile, what's the workaround please?
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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NetworkManager deletes IPs, doesn't restore them
https://bugs.launchpad.net/bugs/388057
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