[Bug 1717567] Re: [FFE] Introduce accept-ra: no to allow disabling Router Advertisement processing

[Mathieu Trudel-Lapierre]

** Changed in: nplan (Ubuntu)
       Status: Triaged => Fix Released

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to nplan in Ubuntu.
https://bugs.launchpad.net/bugs/1717567

Title:
  [FFE] Introduce accept-ra: no to allow disabling Router Advertisement
  processing

Status in nplan package in Ubuntu:
  Fix Released

Bug description:
  There are two related bugs to this:

  https://bugs.launchpad.net/maas/+bug/1655440

  and

  https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1717404

  ...

  The first is the original bug, which lead to disabling processing of
  Router Advertisements by default. Netplan, when no IPv6 address exists
  and DHCPv6 was disabled, would write extra config to not let systemd
  allow RAs. This would avoid otherwise unconfigured interfaces get
  SLAAC IPv6 addresses. This goes against the kernel's own defaults.

  The second is a bug opened because of this change, which we accept as
  a behavioral regression of netplan.

  Given that we would be better served to follow the kernel's defaults,
  and that MAAS can easily ship custom configuration for specific use-
  cases (and that it was a "discussion bug", so not tied to a specific
  need, otherwise fixed by an external change), and that we would do
  well to be as permissive as possible and try everything we can to have
  a network come up, I have reverted the change for bug 1655440.

  This fixes 1717404, but reopens 1655440. To allow special use-cases to
  ship their own configuration with the config they need, let's provide
  an "accept-ra" key in netplan, that will be ON by default (but can be
  toggled off when present) to allow bug 1655440 to be closed.

  I am requesting a Feature Freeze Exception for this change given that
  it is a new (though tiny) feature introduced in netplan past Feature
  Freeze.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1717567/+subscriptions