[Bug 665999] [NEW] ipv6 routes persist after media disconnect

[Ryan Rawdon]

Public bug reported:

I've noticed this for a while when switching from wired to wireless
ethernet on a number of different laptops and architectures (as well as
versions of ubuntu - at least 10.10 and 10.04 and probably a few others
previous).  I am disconnecting from eth0 (physically unplugging the
cable), and the v6 routes associated with this interface are not being
removed from the kernel routing table.  This includes the /64 physically
connected subnet's route as well as the default route.  Please see the
output below


ryan at nova-rrawdon:~$ ip -6 ro sh
2001:470:8:769::/64 dev eth0  proto kernel  metric 256  expires 2591570sec mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
default via fe80::200:24ff:feca:dcb8 dev eth0  proto kernel  metric 1024  expires 1370sec mtu 1500 advmss 1440 hoplimit 64
ryan at nova-rrawdon:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 5c:26:0a:08:56:2d brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether c0:cb:38:06:0f:14 brd ff:ff:ff:ff:ff:ff
5: vboxnet0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 0a:00:27:00:00:00 brd ff:ff:ff:ff:ff:ff


ryan at nova-rrawdon:~$ uname -a
Linux nova-rrawdon 2.6.35-22-generic #34-Ubuntu SMP Sun Oct 10 09:26:05 UTC 2010 x86_64 GNU/Linux
ryan at nova-rrawdon:~$ cat /proc/version_signature 
Ubuntu 2.6.35-22.34-generic 2.6.35.4

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.34
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ryan       2084 F.... pulseaudio
 /dev/snd/pcmC0D0p:   ryan       2084 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xe9660000 irq 47'
   Mixer name	: 'IDT 92HD81B1C5'
   Components	: 'HDA:111d76d5,1028040a,00100104'
   Controls      : 14
   Simple ctrls  : 9
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xe3080000 irq 17'
   Mixer name	: 'Nvidia GT21x HDMI'
   Components	: 'HDA:10de000b,10de0101,00100200'
   Controls      : 16
   Simple ctrls  : 4
Date: Sun Oct 24 15:02:46 2010
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=06538aad-e115-4245-b93a-e3fdf592401b
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100831.2)
MachineType: Dell Inc. Latitude E6410
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=ecdab842-1204-4e81-9362-a48418ff725a ro quiet splash nomodeset
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
dmi.bios.date: 07/08/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0K42JR
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd07/08/2010:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn0K42JR:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kernel-net maverick needs-upstream-testing

-- 
ipv6 routes persist after media disconnect
https://bugs.launchpad.net/bugs/665999
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