[Bug 1771704] Re: support for ipv4 link-local addressing

[Mathieu Trudel-Lapierre]

** Also affects: netplan.io (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1771704

Title:
  support for ipv4 link-local addressing

Status in netplan:
  In Progress
Status in netplan.io package in Ubuntu:
  New

Bug description:
  Per https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1717983,
  link-local address support was previously handled via integration
  between avahi-autoipd and dhclient.  systemd-networkd does not invoke
  dhclient.  It also has direct support for configuring link-local ipv4
  addresses.  But this support is not enabled by default.

  It should be possible for a system configured via netplan to make use
  of link-local ipv4 addresses, without needing to configure systemd-
  networkd directly.

  Historically we do not turn on link-local ipv4 support automatically
  on servers (avahi-autoipd not installed by default), and we use link-
  local addresses only as a fallback when dhcp gives no response.  So
  this should likely not be enabled by default, but instead be exposed
  as an additional configuration option in netplan yaml.

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