[Bug 1763608] Re: Netplan ignores Interfaces without IP Addresses

[Mathieu Trudel-Lapierre]

Indeed; but this is meant to be that way -- there is no usefulness in
having a network device listed in the file without any configuration, as
you can always just do "ip link set $device up" to bring it up.

If there is no configuration, the device is left alone, as it should be.

If you must have an interface brought up but with no addresses, you may
wish to also set:

dhcp4: off
dhcp6: off

These should force netplan to write out extra systemd configuration to
disable DHCP, the new files present for systemd may help bringing up the
interface.

** Package changed: nplan (Ubuntu) => netplan

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https://bugs.launchpad.net/bugs/1763608

Title:
  Netplan ignores Interfaces without IP Addresses

Status in netplan:
  New

Bug description:
  The "manual" method in /etc/network/interfaces resulted in an
  interface being brought up, but not having an IP address assigned.

  When configuring an Interface without an IP Address, netplan ignores
  the interface instead of bringing it up.

  ---
  network:
    version: 2
    renderer: networkd
    ethernets:
      eth1: {}

  Expected result from `netplan apply`: eth1 is brought up.
  Actual result: eth1 is still down.

  Similarly `netplan generate` does not generate any file in
  /run/systemd/network for eth1.

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