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add ipv4.link-local=fallback

Dominique Martinet requested to merge martinetd/NetworkManager:ll4_until_dhcp into main

Summary

This allows to set an IPv4 link-local address until a DHCP lease has been obtained and drop it at that point.

See discussions in #1555, #1562 (closed)

Purpose

The current ipv4.link-local=enabled setting probably violates RFC3927[1] which says:

  a host SHOULD NOT have both an operable routable address and an IPv4
  Link-Local address configured on the same interface.

This implements a solution that is more standard and conforms to what others are doing.

Link: https://github.com/systemd/systemd/issues/13316 Link: https://datatracker.ietf.org/doc/html/rfc3927#section-1.9 [1]

Checklist

Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:

  • the subject for all commits is concise and explicative
  • the message for all commits explains the reason for the change
  • the source is properly formatted
  • any relevant documentation is up to date
  • you have added unit tests if applicable
  • the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.
Edited by Dominique Martinet

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