Test kernels for this issue (as explained in comment #23) are now available for Precise (3.2-based) and Trusty (3.13-based), for both amd64 and i386 systems. To test, download *one* of these then install with "dpkg -i thatfile.deb":
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/precise_amd64/linux-image-3.2.0-77-generic_3.2.0-77.112+lp994931_amd64.deb http://kernel.ubuntu.com/~kamal/lp994931-ipv6/precise_i386/linux-image-3.2.0-77-generic_3.2.0-77.112+lp994931_i386.deb http://kernel.ubuntu.com/~kamal/lp994931-ipv6/trusty_amd64/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_amd64.deb http://kernel.ubuntu.com/~kamal/lp994931-ipv6/trusty_i386/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_i386.deb We'd like feedback from affected parties who can test this on Trusty 3.13 and Precise 3.2 systems. Does this kernel resolve your issue, and do you observe any obvious IP-related trouble with it? For reference, the source code branches for those are here: http://kernel.ubuntu.com/git?p=kamal/ubuntu-trusty.git;a=shortlog;h=refs/heads/lp994931-ipv6 http://kernel.ubuntu.com/git?p=kamal/ubuntu-precise.git;a=shortlog;h=refs/heads/lp994931-ipv6 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/994931/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
