[Bug 1623068] Re: Networkd fails to configure a ethernet network device on a 3.4 kernel

[Martin Pitt]

As I said I cannot test this patch on a current kernel really as it
works just fine with IPv6 disabled. Please test this, and if it works
for you I can send this upstream and SRU.

** Patch added: "proposed patch"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1623068/+attachment/4740854/+files/0001-networkd-do-not-create-send-IFLA_AF_SPEC-container-i.patch

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Title:
  Networkd fails to configure a ethernet network device on a 3.4 kernel

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Knowing that a 3.4 based kernel is unsupported we have to get it
  working for a specific customer.

  Systemd itself boots up nicely already but networkd fails to configure
  a network device with the following configuration file in
  /etc/systemd/network

  $ cat /etc/systemd/network/enp1s0.network 
  [Match]
  Name=enp1s0

  [Network]
  DNS=8.8.8.8
  Address=192.168.178.30
  Gateway=192.168.178.1

  This gives the following error messages

  $ sudo /lib/systemd/systemd-networkd
  Enumeration completed
  enp1s0: Could not bring up interface: Invalid argument
  enp1s0: Could not set route: Invalid argument

  ifupdown or NetworkManager is reliable able to get the same interface
  up and configured.

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