This is incomplete request, essentially requesting "backport all of
networkd" which is not appropriate for a targetted fixes that SRUs
require.
Can you not use zesty on your system?
** Changed in: systemd (Ubuntu Xenial)
Status: New => Incomplete
** Changed in: systemd (Ubuntu Yakkety)
Status: New => Incomplete
** No longer affects: systemd (Ubuntu Xenial)
** No longer affects: systemd (Ubuntu Yakkety)
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https://bugs.launchpad.net/bugs/1673092
Title:
systemd doesn't wait until the tentative flag isn't removed before
firing units depending on network-online.target
Status in systemd package in Ubuntu:
Fix Released
Bug description:
[Impact]
See this issue for details
https://github.com/systemd/systemd/issues/2037
Basically, while DAD is running checks on a ipv6 address, no service can
bind the interface, which could provoke units to fail. Disabling DAD is
a workaround as explained here [1], but ideally systemd should wait until
the tentative flag is removed. v232 doesn't have this issue. Can the relevant
patches be backported to LTS releases?
[Test Case]
1. Configure ipv6 address on one interface
2. Create unit with After=network-online.target that pings a host over
ipv6
3. Restart the system (may need several reboots as it's a race condition)
[Regression Potential]
* Unknown
[Other Info]
* Seems to have been fixed on v232.
* Using ifupdown or networkd to create the interface seems to be irrelevant
(upstream bug report uses networkd, while I use ifupdown)
[1]:
https://www.agwa.name/blog/post/beware_the_ipv6_dad_race_condition
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