[Bug 1833193] Re: systemd-networkd fails to apply static IPv4 when the static IP is the same as previously configured by DHCP

[Dan Streetman]

> I just tested it on Eoan, using systemd 242-6, and the valid__lft and
preferred_lft did indeed change to 'forever'.

well that's interesting...I tested with the latest upstream systemd code
and i *was* able to reproduce the problem...maybe something reverted the
fix since 242.  Unless, of course, I messed up my test :-)  I'll
backport the fix for that and see if it fixes bionic, then retest the
latest upstream to make sure it hasn't reverted.

> The discussion in the GitHub issue was rather interesting as well. I
kind of "agree" that this is a strange thing to do, but I don't think
that should be any of systemd's business..

yes, I agree, and it is an entertaining discussion on what systemd
should prevent users from doing ;)

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https://bugs.launchpad.net/bugs/1833193

Title:
  systemd-networkd fails to apply static IPv4 when the static IP is the
  same as previously configured by DHCP

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  New

Bug description:
  In bionic, running systemd 237-3ubuntu10.22 and netplan.io
  0.97-0ubuntu1~18.04.1, systemd-networkd fails to configure an
  interface with a static IPv4 address if the statically confiugred
  address is the same as the interface already has gotten from DHCP.

  This will cause the interface to loose its IP address when the DHCP
  lease exires, even though you've told netplan to configure it as
  static.

  I expect systemd-networkd to actually configure an IP address as
  static, regardless of what address the interface has before from DHCP.

  # lsb_release  -rd
  Description:	Ubuntu 18.04.2 LTS
  Release:	18.04

  # apt-cache policy systemd
  systemd:
    Installed: 237-3ubuntu10.22

  # apt-cache policy netplan.io
  netplan.io:
    Installed: 0.97-0ubuntu1~18.04.1

  A paste of systemd-networkd's debug log when I run "netplan apply" and
  the interface already has the static IP configured from DHCP.

  It seems like upon a restart, systemd-networkd will allways add
  whatever IP config it had before the service stopped, and then apply
  changes (if any). Since my new config has the same IP as it already
  had, it does nothing even though the new config has static
  configuration.

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