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[Simon Poirier <2115800@xxxxxxxxxxxxxxxxxx>]

** Tags added: dcr-incoming

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https://bugs.launchpad.net/bugs/2115800

Title:
  systemd-networkd on noble with PreferredSource does not install routes

Status in systemd package in Ubuntu:
  New

Bug description:
  Ubuntu Release:
  Description:    Ubuntu 24.04.2 LTS
  Release:        24.04

  Version of package:
  systemd:
    Installed: 255.4-1ubuntu8.8
    Candidate: 255.4-1ubuntu8.8

  Issue:
  Routes with PreferredSource are not being installed properly. There's also an upstream bug report about this: https://github.com/systemd/systemd/issues/31950

  Example .network config:

  ```
  [Match]
  Name=bond0

  [Address]
  Address=10.10.10.100/32
  Peer=10.10.10.98/32

  [Route]
  Gateway=10.10.10.98
  PreferredSource=10.10.10.100

  [Address]
  Address=fd00:abcd:cafe:babe::5406/120

  [Route]
  Gateway=fd00:abcd:cafe:babe::5401
  PreferredSource=fd00:abcd:cafe:babe::5406

  [Network]
  VLAN=bond0.200
  IPv6AcceptRA=no
  DNS=185.12.64.1
  DNS=185.12.64.2
  ```

  Expected behaviour: Routes with PreferredSource are being installed
  properly.

  Actual behaviour: Not all routes with PreferredSource are being
  installed.

  
  Upstream fix that was not included in v255 and would need a backport: https://github.com/systemd/systemd/pull/33875

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