[Bug 1877271] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for systemd has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1877271

Title:
  networkd does not enable ipv6 when requested

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Eoan:
  Fix Released

Bug description:
  [impact]

  if networkd is configured with ipv6 address but the 'disable_ipv6'
  sysctl is enabled, networkd does not enable it and set the ipv6
  configuration.

  [test case]

  [Match]
  Name=ens3

  [Network]
  DHCP=ipv4
  LinkLocalAddressing=ipv6
  Address=2001:db8::100/64

  manually disable ipv6 for the interface:

  ubuntu at lp1859862-b:~$ echo 1 | sudo tee /proc/sys/net/ipv6/conf/ens3/disable_ipv6
  1

  the interface should not contain any ipv6 addresses:

  ubuntu at lp1859862-b:~$ ip -6 a show ens3
  ubuntu at lp1859862-b:~$

  restart networkd; it should enable ipv6 as ipv6 addresses are
  configured, but it does not:

  ubuntu at lp1859862-b:~$ sudo systemctl restart systemd-networkd
  ubuntu at lp1859862-b:~$ ip -6 a show ens3
  ubuntu at lp1859862-b:~$

  [regression potential]

  any regression would likely result in failure to configure ipv6
  addresses/routes.

  [scope]

  this is needed only for Eoan.

  this is fixed by commit 57ad76074670d4859e808a6aabd69fd6e58514c5,
  which is included starting in v243, so this is fixed in Focal and
  later.

  this bug was introduced by a series of patches starting at
  54a1a535bd60f13964bbddd8f381601e33e8e56f, which is included starting
  in v243, but was also pulled into Debian v242-4, and so included in
  Eoan.  This bug is not present in earlier versions so is not needed in
  Xenial or Bionic.

  [other info]

  this is a follow on for the fix in bug 1859862.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1877271/+subscriptions