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

[Simon Fels]

Yes, the kernel has IPv6 support enabled so socket_ipv6_is_supported()
returns true and with that it tries to setup the IPv6 part of the
interface.

The two problems which I've found so far are:

 - an empty IFLA_AF_SPEC seems to cause the kernel to return EINVAL
 - having IPv6 enabled and IFLA_AF_SPEC is filled with the ipv6ll mode we get EINVAL

So to fix this we have to do two things:

 1. disable IPv6 support in the 3.4 kernel; if that is not acceptable for the real product later than we have to find another solution.
 2. move the open/close_container() inside the if() statement to avoid an empty container.

For 2. we may can work around this on the kernel side too to allow empty
IFLA_AF_SPEC containers.

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https://bugs.launchpad.net/bugs/1623068

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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