[Bug 1713226] Re: systemd-networkd messes up networking

[Dimitri John Ledkov]

Steve,

It seems that unconditional enablement and start of networkd in
src:systemd.postinst has side-effects, especially when netwokr-manager
is directly managing desktop systems, without netplan.

I think we should not unconditially enable and start entworkd in
src:systemd.postinst, and instead have networkd enable baked into cloud-
images and/or done by netcfg or the netplan generator on boot.

** Changed in: systemd (Ubuntu)
     Assignee: (unassigned) => Steve Langasek (vorlon)

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https://bugs.launchpad.net/bugs/1713226

Title:
  systemd-networkd messes up networking

Status in network-manager package in Ubuntu:
  New
Status in nplan package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Since systemd-234-2ubuntu8 systemd-networkd is enabled by default.

  This causes problems existing configurations
  ex1: if the network has ipv6 enables (the host recieves a router advertisement), networkmanager does not configure the network anymore so you get only ipv6 and no ipv4 connections (since systemd-networkd seems to bring only the link up)

  ex2: if you use systemd-nspawn and configured static ip addresses in
  /etc/network/interfaces, systemd-networkd adds a dhcp obtained address
  on the host0 adapter and a 169.254 address

  For the average user both is not expected, so my solution was
  systemctl disable systemd-networkd, but since you seem to insist
  having this enabled, it must be made sure systemd-networkd does not
  touch existing configurations.

  My suggestion is:
  1) if /etc/network/interfaces contains anything other than lo -> do not enable systemd-networkd
  2) if network-manager is enabled, systemd-networkd must be disabled and vice versa

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