** Changed in: linux (Ubuntu)
Assignee: Tim Gardner (timg-tpi) => Kamal Mostafa (kamalmostafa)
** Changed in: linux (Ubuntu Precise)
Assignee: Tim Gardner (timg-tpi) => Kamal Mostafa (kamalmostafa)
** Changed in: linux (Ubuntu Trusty)
Assignee: Tim Gardner (timg-tpi) => Kamal Mostafa (kamalmostafa)
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https://bugs.launchpad.net/bugs/994931
Title:
Altering use_tempaddr drops all IPv6 addresses
Status in The Linux Kernel:
Invalid
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Precise:
In Progress
Status in linux source package in Trusty:
In Progress
Status in linux source package in Utopic:
Invalid
Bug description:
$ uname -a
Linux expvr-alnilam 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59
UTC 2012 i686 i686 i386 GNU/Linux
$ sysctl net.ipv6.conf.eth2.use_tempaddr
net.ipv6.conf.eth2.use_tempaddr = 2
# (as per the default /etc/sysctl.d/10-ipv6-privacy.conf in 12.04)
# Add a static IPv6 address:
$ sudo ip addr add 2001:470:9321:f003::1122/64 dev eth2
# Verify that it has been set up, and that a temporary address and a SLAAC
address also exist:
$ ip -6 addr list dev eth2
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:470:9321:f003:74e3:aa2b:7ee5:c002/64 scope global temporary
dynamic
valid_lft 86393sec preferred_lft 14393sec
inet6 2001:470:9321:f003:6c97:24ff:fe3f:263b/64 scope global dynamic
valid_lft 86393sec preferred_lft 14393sec
inet6 2001:470:9321:f003::1122/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::6c97:24ff:fe3f:263b/64 scope link
valid_lft forever preferred_lft forever
# Disable RFC 4941 temporary addresses:
$ sudo sysctl net.ipv6.conf.eth2.use_tempaddr=0
net.ipv6.conf.eth2.use_tempaddr = 0
$ ip -6 addr list dev eth2
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 fe80::6c97:24ff:fe3f:263b/64 scope link tentative
valid_lft forever preferred_lft forever
I.e. on setting use_tempaddr=0, _all_ IPv6 addresses are removed,
including statically-configured and non-temporary SLAAC-configured
addresses. (The link-local address reappears quickly but the
'tentative' flag indicates that it has been newly re-added. The SLAAC
address reappears after a slightly longer interval as the kernel
continues to undergo SLAAC, but the static address is gone forever
unless manually reinstated.)
The same happens if use_tempaddr is changed from 0 back to 2.
The expected outcome is that only temporary addresses are affected by a
change to use_tempaddr.
---
AcpiTables:
AlsaDevices:
total 0
crw-rw---T 1 root audio 116, 1 May 5 03:53 seq
crw-rw---T 1 root audio 116, 33 May 5 03:53 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.0.1-0ubuntu7
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
DistroRelease: Ubuntu 12.04
IwConfig: Error: [Errno 2] No such file or directory
Lspci: Error: [Errno 2] No such file or directory
Lsusb: Error: [Errno 2] No such file or directory
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen.linux
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: root=UUID=b16ffd9c-a54a-4dd3-a839-16c382ea8787 ro
console=hvc0
ProcModules:
lp 17455 0 - Live 0x00000000
parport 40930 1 lp, Live 0x00000000
xenfs 17877 1 - Live 0x00000000
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
RelatedPackageVersions:
linux-restricted-modules-3.2.0-24-generic-pae N/A
linux-backports-modules-3.2.0-24-generic-pae N/A
linux-firmware 1.79
RfKill: Error: [Errno 2] No such file or directory
Tags: precise
Uname: Linux 3.2.0-24-generic-pae i686
UpgradeStatus: Upgraded to precise on 2012-05-05 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
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