[Bug 1699942] Re: network-manager fails to deprecate addresses

[Nick Rosbrook]

This bug is stale, and it remains unclear if there is a systemd bug, so
marking invalid.

** Changed in: systemd (Ubuntu)
       Status: Incomplete => Invalid

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Title:
  network-manager fails to deprecate addresses

Status in linux package in Ubuntu:
  Incomplete
Status in network-manager package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  Invalid

Bug description:
  network manager does not properly deprecate autoconfigured temporary IP addresses when ValidLifetime for a prefix is 0 in router advertisements. This behaviour is non-compliant with RFC 4861 § 6.3.4, which reads:
          If the prefix is already present in the host's Prefix List as
          the result of a previously received advertisement, reset its
          invalidation timer to the Valid Lifetime value in the Prefix
          Information option.  If the new Lifetime value is zero, time-out
          the prefix immediately.

  The hosts instead continued to use temporary addresses configured
  until they reached their timeout, rather than immediately dropping the
  addresses. It further appears that it is generating new temporary
  addresses when the previous ones expire, but I have not been
  monitoring hosts closely enough to tell for sure---I will update on
  this when I have further information.

  This problem was discovered on Ubuntu Studio 16.04.2; it is not
  present on Ubuntu Server (which uses Debian networking scripts).

  Additional Info:

  $ lsb_release -rd
  Description:	Ubuntu 16.04.2 LTS
  Release:	16.04
  $ apt-cache policy network-manager
  network-manager:
    Installed: 1.2.6-0ubuntu0.16.04.1
    Candidate: 1.2.6-0ubuntu0.16.04.1
    Version table:
   *** 1.2.6-0ubuntu0.16.04.1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.2.2-0ubuntu0.16.04.4 500
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
       1.1.93-0ubuntu4 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

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