https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c1 --- Comment #1 from Freek de Kruijf 2011-11-22 11:31:31 UTC --- I changed the value of temp_prefered_lft to two days. # cat /proc/sys/net/ipv6/conf/eth0/temp_prefered_lft 17280 and watched the output of avahi to syslog os121:~ # grep 'avahi-daemon\[702\]' /var/log/messages | tail -12 Nov 22 09:23:17 os121 avahi-daemon[702]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.84. Nov 22 09:23:17 os121 avahi-daemon[702]: New relevant interface eth0.IPv4 for mDNS. Nov 22 09:23:17 os121 avahi-daemon[702]: Registering new address record for 192.168.1.84 on eth0.IPv4. Nov 22 09:23:23 os121 avahi-daemon[702]: Registering new address record for 2001:980:7480:1:a00:27ff:fe62:3c29 on eth0.*. Nov 22 09:23:23 os121 avahi-daemon[702]: Withdrawing address record for fe80::a00:27ff:fe62:3c29 on eth0. Nov 22 09:23:23 os121 avahi-daemon[702]: Registering new address record for 2001:980:7480:1:6d1f:7bb4:113c:7dfe on eth0.*. Nov 22 10:23:19 os121 avahi-daemon[702]: Registering new address record for 2001:980:7480:1:15ee:b4b6:41b0:e143 on eth0.*. Nov 22 10:23:22 os121 avahi-daemon[702]: Withdrawing address record for 2001:980:7480:1:6d1f:7bb4:113c:7dfe on eth0. Nov 22 10:34:44 os121 avahi-daemon[702]: Registering new address record for 2001:980:7480:1:74af:87c8:5231:c990 on eth0.*. Nov 22 10:34:48 os121 avahi-daemon[702]: Withdrawing address record for 2001:980:7480:1:15ee:b4b6:41b0:e143 on eth0. Nov 22 11:34:29 os121 avahi-daemon[702]: Registering new address record for 2001:980:7480:1:258d:ae76:d03e:c88b on eth0.*. Nov 22 11:34:33 os121 avahi-daemon[702]: Withdrawing address record for 2001:980:7480:1:74af:87c8:5231:c990 on eth0. os121:~ # !cat cat /proc/sys/net/ipv6/conf/eth0/temp_prefered_lft 17280 os121:~ # So even with 2 days lifetime the address changes each hour. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c3 Wolfgang Rosenauer changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |wolfgang@rosenauer.org AssignedTo|bnc-team-screening@forge.pr |mt@suse.com |ovo.novell.com | Severity|Normal |Major --- Comment #3 from Wolfgang Rosenauer 2012-02-28 20:17:18 UTC --- I just found that this is the reason for the issue I see with broken connections for IMAP and IRC (which is pretty annoying btw). On my system everything is default which means use_tempaddr=2 and Hygiea:~ # cat /proc/sys/net/ipv6/conf/eth0/temp_prefered_lft 86400 Nevertheless my temporary address is only valid for around 17 minutes according to avahi log messages. This is at least a major issue for fully connected IPv6 systems as mine. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c5 --- Comment #5 from Wolfgang Rosenauer 2012-02-29 08:44:29 UTC --- Oh, after more research I found that the interface lifetime is controlled by the IPv6 router ICMPv6 messages apparently. I can confirm that my router sends Router lifetime: 1800 Valid lifetime: 1800 Preferred lifetime: 1200 Those lifetimes and the 600 max_desync_factor could explain the situation for me. Therefore it's not a bug in openSUSE. If someone can confirm that it works that way and maybe Freek can confirm that it's a similar issue for him we can close that? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c7 Marius Tomaschewski changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|mt@suse.com |kernel-maintainers@forge.pr | |ovo.novell.com --- Comment #7 from Marius Tomaschewski 2012-02-29 12:17:41 UTC --- Reassigning to kernel maintainers. I'd say it is invalid, but I didn't verified it. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c9 Marius Tomaschewski changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID --- Comment #9 from Marius Tomaschewski 2012-02-29 17:45:39 UTC --- 18:34:26: # ip a s ...:f12e:6cc:46a7:ac89/64 scope global temporary dynamic valid_lft 586165sec preferred_lft 67165sec after almost 5 hours, the temp address is still the same... works. (In reply to comment #1)

I changed the value of temp_prefered_lft to two days.

# cat /proc/sys/net/ipv6/conf/eth0/temp_prefered_lft 17280 ..

Ahm... 17280 is something like 4 hours and 48 min, not two days. IMO definitively INVALID, resolving as such. Fix the lifetimes in the router RA. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c11 --- Comment #11 from Marius Tomaschewski 2012-03-01 09:43:50 UTC --- (In reply to comment #10)

This is quite unsatisfactory in the sense that the documentation suggests that setting these parameters has an effect. Apparently it is the router that determines what these lifetime values will be. In my case I have no control over these parameters, they are fixed in the router and not changeable. High priority, valid lifetime initially 7200 later RAs have lower values, and preferred lifetime 3600.

Well, the prefix lifetimes in the router RA specify the upper limit for these settings -- when the prefix is not valid any more, you can not continue to use any address in it :-). You can override the prefix lifetimes and tell the kernel it should use even _lower_ settings than the lifetime of the prefix for the temp addresses. For example when the router RA defines (defaults values): AdvValidLifetime 2592000; // 4w2d AdvPreferredLifetime 604800; // 1w for the prefix and you set: sysctl -w net.ipv6.conf.all.temp_prefered_lft=3600 (1 hour instead of a default of 1 day [86400]) sysctl -w net.ipv6.conf.all.temp_valid_lft=10800 (3 hours instead of a 7 days default [604800]) then you'll get the following life times: - for the temporary IPv6 addresses: lower lifetimes as specified in temp_*_lft settings - for the modified EUI-64 (MAC based) address: lifetimes from the prefix

Apparently I forgot a 0 behind 17280 to have two days.

For me this is only fixed when the documentation contains a warning that these values have no effect when the router provides these values with a higher or equal priority. I will document this in the wiki.

Documenting it in wiki would be cool! The documentation of the settings is quite sparing... /usr/src/linux/Documentation/networking/ip-sysctl.txt temp_valid_lft - INTEGER valid lifetime (in seconds) for temporary addresses. Default: 604800 (7 days) temp_prefered_lft - INTEGER Preferred lifetime (in seconds) for temporary addresses. Default: 86400 (1 day) -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=731730 https://bugzilla.novell.com/show_bug.cgi?id=731730#c13 --- Comment #13 from Adam Spiers 2012-09-10 15:57:51 UTC --- (In reply to comment #12)

Please could some kind person provide a link to the wiki page where this is now documented? Thanks!

Never mind, I guess it must be this one: http://en.opensuse.org/SDB:Native_IPv6 I improved the text a bit and linked back to this bug. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.