Thanks for keeping the bug updated
** Changed in: network-manager (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1695601
Title:
IPv6 temporary/privacy addresses lifetime are not renewed upon new
ICMPv6 Router-Advertisement packet
Status in network-manager package in Ubuntu:
Fix Released
Bug description:
My ISP's router provides IPv6 connectivity and advertises valid
lifetime of 900 secs and preferred lifetime of 300 secs. My Ubuntu
17.04 (and previous) installation has been showing weird behavior over
IPv6, with connections dropping quite often but on a regular basis.
After extensive debugging and verification that there was no issue on router
side, and on WiFi physical connection, I have verified that this was not
related to the lack of ICMPv6 RA packets.
Running |watch -d -n1 ip -6 addr show dev wlan0| shows:
- decreasing valid_lft and preferred_lft on both IPv6 addresses
- upon ICMPv6 RA packet received, the global SLAAC address derived from MAC
gets valid_lft and preferred_lft field updated
- at the same time, the privacy extension address is still decreasing
System uses NetworkManager to handle all of that. I could verify that
my desktop system, running Debian Sid with NetworkManager v1.6 was not
exposing the issue.
Running NetworkManager in debug mode gives more informations:
> nm_ubuntu_zesty.log:NetworkManager[2418]: <trace> [1496447074.7897]
platform-linux: event-notification: NEWADDR, seq 0:
2a01:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:39c5/64 lft 900sec pref 300sec lifetime
289-289[300,900] dev 3 flags secondary src kernel
> nm_ubuntu_zesty.log:NetworkManager[2418]: <trace> [1496447074.7901]
platform-linux: event-notification: NEWADDR, seq 0:
2a01:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:39c5/64 lft 622sec pref 22sec lifetime
289-289[22,622] dev 3 flags secondary src kernel
The two timestamps of the NEWADDR event are very very close. The first
one shows proper update of the lifetimes values ; while the second one
shows invalid values being pushed. With those informations in mind, I
dug a little bit in the NetworkManager source code, and I found that
there was one change between v1.4.4 (current Zesty package) and v1.6
(Debian sid package) that was touching the code handling IPv6
addresses sync:
https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=1dbd9d7948
; the commit states that without this change, NM might overwrite IPv6
temporary addresses changes.
I took my chance and rebuilt network-manager-1.4.4 package with that
patch included: IPv6 temporary privacy extensions enabled addresses
gets proper updates of their lifetime when ICMPv6 packets reaches my
system.
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